How to Use Mattermost

Read this document to get familiar with Mattermost. It is used to communicate with XR groups as well as have 1-to-1 conversations. You can also watch this video for a general introduction to Mattermost and its benefits.


If you need support with:

Please join one of the weekly sessions:

Tuesdays 18:00-18:30 (quick questions)

Thursdays 18:30-19:30 (longer training)

Join Zoom Meeting:

Meeting ID: 895 2855 8324 | Passcode: 278766

For a series of video guides to supplement the below information, see Video Guides to Help You Learn.

First Steps

Getting Access

Before you can access Mattermost you first need to sign up to the XR UK Communications Hub. For instructions on how to do that please read this guide.

Once you are on the Hub you can access Mattermost in a few ways:

  1. Click on the Mattermost icon from the Hub main page. Mattermost icon small.png

  2. Type into your browser and hit Enter.

Once this is done we recommend adding the page to your bookmarks/favourites so it's easier to find in future.

Note: Mattermost is also available as an app so you can install it to your smartphone or tablet. Please read this document or watch this video for instructions on how to do this.

Landing Page

When you have logged in to Mattermost you will see a screen that looks a lot like this:

mattermost homepage annotated with numbers.png

Note that we have added numbers to the screenshot and we will refer to this image throughout the document.


Please watch this very helpful video for a guide to navigating Mattermost: from using Teams and Channels to saving and threading messages.


Teams in Mattermost are basically collections of Channels. They appear on the far left of your screen (1) and you can click on the icons to switch between them.

You will be added to the UK Team by default but your group might use other Teams and you will see these too.

Checking who else is in my Team

To see the other members of a Team, click on the Main Menu (3) and select View Members.

Joining other Teams

For UK Circles with their own Team, you can contact them via their Reception Channel in UK Team.

To join a public Team, click on the + sign above your list of Teams (1). This will bring up a list of all the other XR public Teams you are able to join, including for other countries. Click on one of the list of Teams to add yourself.

If you want to be added to a private Team (e.g. for your local group) you will need to speak to a Group Admin/Tech Champion who will be able to send you an invite.

Leaving a Team

To leave a Team, open the Main Menu (3), and then select the option Leave Team.

Note that once you have left a Team, if you want to re-join at any point, you will have to join (or be invited to) all the Channels you belong(ed) to previously.


Channels are just another name for group chats. Every local group/working group set up on the Hub will have several of these Channels that you will be added to if you are part of that group.

Note: For a walkthrough of Channels you can watch the Finding and Joining Channels video (4 mins).

Type of Channels

types of channels.png

Most Channels are public, so anyone in the Team can join them. They have a picture of the world next to them. Some Channels are private, by invitation only, and they have a padlock next to them.

Joining Channels

To join a public Channel either click in Find Channel and search, or click the + button to browse Channels on the left (4). This will bring up a list of all of the public Channels in your Team. Click on any of these in the list to add yourself.

If you want to join a private Channel you should ask someone already in that Channel to add you. You could also post a message in that group's reception Channel asking to be added.

Leaving a Channel

To leave a Channel, click on the its name at the top of the screen (not where it appears on the left) and then select the option Leave Channel. Alternatively if you hover over the Channel on the left three dots will appear next to it and from that menu you can select Leave Channel.

Muting Channels

You can mute a Channel if you want to stop receiving notifications from it but don't want to leave. To do this click the Channel heading (at the top of the screen), or hover over the Channel on the left and click the three dots, then click Mute Channel. You can also set whether you want to be notified if someone uses @all or @channel by clicking on Notification Preferences.

Default Channels

Every Team has two default Channels that you will be added to when you are added to the team:

Very Important: Please do not rename these default Channels as it will cause a lot of confusion.

Note: It is not possible to leave the Town Square Channel. If you want to stop receiving notifications you should mute the Channel instead.

Sorting Channels

If you hover over the CHANNELS header on the left (6) then click on the three dots you can sort your Channels one of three ways:

If this isn't enough you can Create New Category which enables you to sort Channels into groups that suit you, for instance relating to particular projects or areas of interest. Once you have created your categories you can drag and drop Channels between them.

Contacting other groups

All XR UK groups on Mattermost have a public 'Reception' Channel in the UK Team, and their members will be added to them by default (you will probably be in some yourself). This lets rebels from other groups find and speak to them.

To join someone else's reception Channel, go to the UK Team, click Find Channel or + (4), to search or browse for the Channel you want to join and then click Join. The Channel will then appear in your Channels list.

Creating Channels

Important: You should not create public Channels from inside Mattermost. Instead please get your Group Admin/Tech Champion to do this for you using the Hub.

To create a private Channel:

  1. Click on the + sign next to Find Channel (4)
  2. Select 'Create new Channel'
  3. Enter a name for the new Channel (and optional purpose and header), ensure Private is selected.
  4. Click Create Channel

Channel headers (18)

Underneath the Channel name at the top of the page is the Channel header. It is a useful place to put information about what the Channel is for and to store some useful links (e.g. your group's Forum or your regular Zoom meetings).

To see all the info click on the Channel name:

channel header_resized.png

then click on View Info.

If you want to change what is written in the header click on Edit Channel Header. If you want to add links to this section the process is the same as here. Please confirm with your Group Admin before making any change to the Header.

Sending Messages (14)

You can write messages by typing in the box at the bottom of the screen. To send them hit Enter. The message will be sent to the Channel or Direct Message you are currently in.

Alerting people to messages

If you want a particular person to read a message you are sending, you can tag them by writing '@' followed by their username (e.g. @xrukadmin). This will send them a notification.

Important: You can also use @all or @channel to notify everyone in a Channel but please use this responsibly as for larger groups it is rarely appropriate and may annoy people.

Sending Direct Messages (7)

To send someone a Direct Message (instead of posting in a Channel):

  1. Click the + sign to the right of the heading DIRECT MESSAGES (7)
  2. Select the users you want to message (you can create group messages with up to a maximum of 6 people)
  3. Write and send your message

All of the Direct Message conversations that you have had will appear below the DIRECT MESSAGES heading to make it easier to contact them again. Next to each name, an icon shows whether they are online or not. Clicking on a username will display your Direct Message history with that user. Users you do not need to contact regularly can be removed from this list by pressing the cross to the right of their name.

Sorting your Direct Messages

Much like with Channels, Direct Messages can be sorted alphabetically or most recent first. You can also choose how many to show (all, 10, 15...). To change these settings hover over DIRECT MESSAGES then click the three dots to the right of it.

Replying to messages

It is possible to reply to messages posted in Channels or Direct Messages using 'Threads' (5). These are helpful if you are having multiple conversations at once so people don't get confused about which messages are related to which discussion. You can click Threads on the left-hand side of the screen to see these conversations. To reply to a message in a thread click on the Reply icon:


Note: For a full explanation you can watch the threading messages video (5 mins).

Reacting to messages

To add a reaction (e.g. a thumbs up or heart icon) to a message click on the Add Reaction icon:


To post a reaction to a message you can click on the Emoticon icon on the bottom right of the message (16).

Searching for messages (10)

Use the search box to find messages and replies that match the search terms that you enter. All Channels that you are a member of in the current Team are searched.

Note: For a full explanation you can watch the Searching for messages video (3 mins).

Saving messages

You can click on the 'save' icon (like a bookmark) next to a message to save it for later, then bring up all your saved messages by clicking on the 'Saved posts' icon at the top right of the screen (11).

Note: For a full explanation you can watch the Saving messages video (3 mins).

To add a picture click on the paperclip icon on the bottom left hand side of the screen (15). To add a nicely formatted link to your message, write the text you want to show in square brackets immediately followed by the link URL in round brackets. For example:

Check out this fantastic [guide to Mattermost](!

will look like:

Check out this fantastic guide to Mattermost!

when sent.

Other formatting tips

Here are a few simple tips to make your messages look better:


Copying messages

It can be difficult to copy messages in order to share them in multiple Channels without losing the nice formatting and any links. Currently the only way this is to:

  1. Open settings (17) and click on Advanced.
  2. Set Enable Post Formatting to Off.
  3. Copy and paste the messages that you want to share.
  4. Return to Advanced and set Enable Post Formatting back to On.

Rebel Compass (8)

This takes you to a bunch of links and resources from XR Global including plaforms, videos, documents, trainings, events etc.

Notification settings

Note: For a walkthrough of all the content in this section you can watch the Notifications (5 mins) and Account Settings (4 mins) videos.

To get the most out of Mattermost we strongly encourage you take the time to get your notification settings set up just right. This will make sure that you don't get overwhelmed by huge numbers of irrelevant notifications, and also that you won't miss any important messages that you need to see.

To modify the notification settings in Mattermost, open your settings (17) and click on Account Settings. You will then see this screen:


Setting desktop/mobile notifications

To modify these settings click Edit under the sections labelled Desktop Notifications or Mobile Push Notifications.

We recommend that Send desktop notifications (under Desktop Notifications) and Send mobile push notifications (under Mobile Push Notifications) are set to either For all activity or For mentions and direct messages.

Enabling email notifications

You can enable email notifications of Mattermost messages. To do this:

  1. Open your notification settings (see 'Notification Settings' above)
  2. Under Email Notifications click Edit
  3. Under Send email notifications tick Immediately
  4. Click Save

Setting notifications for reply threads

To be notified of all messages that happen in a thread you participated in you should:

  1. Open your notification settings (see 'Notification Settings' above)
  2. Under Reply notifications click Edit
  3. Tick Trigger notifications on messages in reply threads that I start or participate in
  4. Click Save

Personalising your mentions

It is possible to get notified everytime a certain word gets mentioned in one of your channels. By default this will just be your username including the @ symbol (e.g. @myusername) but you can add extra words if you like. For example, if you do a lot of work on the Rebel Toolkit you may want to add toolkit to your list of words that trigger mentions. To set this up:

  1. Open your notification settings (see 'Notification Settings' above)
  2. Under Words That Trigger Mentions click Edit
  3. Tick any of the tickboxes that apply
  4. Add any additional keywords (e.g. toolkit) in the space below the tickboxes
  5. Click Save

Seeing recent mentions (10)

Click on the top right @ sign to see posts where you have been mentioned recently.

Grouping unread messages together

You can get Mattermost to collect unread messages at the top of the sidebar so they are easier to find. To do this:

  1. Open the Mattermost settings (see 'Notification Settings' above)
  2. Click on the Sidebar tab
  3. Under Channel Grouping and Sorting click Edit
  4. Tick Unreads grouped separately
  5. Click Save

Setting up 'out-of-office' messages

If you will not be reachable on Mattermost for a while and would like to set an automatic reply that anyone who messages you will see then you should:

  1. Open your notification settings (see 'Notification Settings' above)
  2. Under Automatic Direct Message Replies click Edit
  3. Tick Enabled and write your message
  4. Click Save

You can follow the same process to disable the automatic messages when you return.

Getting rid of annoying messages from 'System'

In your Channels you will probably see lots of messages from 'System' notifying you that people have been added to, and left the Channel. You can turn these off by:

  1. Open the Mattermost settings (see 'Notification Settings' above)
  2. Click Advanced
  3. Set Enable Join/Leave Messages to Off

Further information

Setting your status

To change your status (which can be Online, Away, Do Not Disturb and Offline):

  1. Click on your image/icon at the top left of the screen (2)
  2. Click on the option that you want

Adding a profile picture

To add a profile picture to your Mattermost account:

  1. Click on (2) in the top right corner of the screen
  2. Click on Profile
  3. Scroll down and click Profile Picture, then click Edit
  4. Upload an image of your choice
  5. Click save!

Logging out

To log out of Mattermost, click on (2) (your profile picture) in the very top right corner of the screen and then click on Logout.

Other places to find information about Mattermost

There is a help button (12) at the top right hand side of the screen.

Here is list of other resources about Mattermost that you might find useful after reading this guide:

When to use the Forums instead of Mattermost

What is the difference between chat and discussion?

Chat (Mattermost) and discussion (Forums) are two very different things. This document attempts to explain their individual uses.

Think of chat (Mattermost) as being a bit like conversations around a table in a cafe or pub or at a large dinner. There are multiple things going on at the same time, it may get noisy, threads get interrupted and side-tracked. There is a lot of good social communication going on, but the focus is more on exchange of ideas than working on a particular topic. It’s a big room, and you can move around multiple tables listening to what is going on and chipping in.

Think of discussion (Forums) as more like a meeting or conference with break-out sessions going on in parallel. Each category is a session, and each session might include several agenda items (topics). The sessions are focused on a particular area and are working on solving problems and developing ideas in that area.

Some people need one, some the other, some both.

Chat is more ephemeral; discussion is where work gets done. Trying to have a single system handle both inevitably involves compromises and results in confusion. In chat, it is often difficult to find previous ideas, and you therefore don’t want useful information which you might need again to be lost in there. In discussion, you are focussed on a specific topic and may want to avoid immediate distractions – difficult in chat rooms.

Chat benefits from quick responses, so a good mobile app can be important, but we must be careful not to exclude those without smartphones. One failing of the widely-used WhatsApp chat application is that it does require you to have a smartphone to use it. Even Signal, which can be used on a laptop without a tethered phone, requires access to a smartphone to initially set it up.

Discussion requires more active listening, considering what is said and providing a thoughtful response. Here mobile ‘presence’ is less important, and the layout needs to make it easy to find contributions and provide more detailed replies. A larger screen than a phone and a proper keyboard are often useful.

What tools should I be using?

Most Rebels involved in organising local or working groups will need discussion and should be on the Forum.

Less active people may not need online discussion at all, or they may occasionally respond to a call to participate in an important decision for the group, dipping into a discussion forum to do so.

For a local group, chat is probably what most people will use for day to day keeping in touch with each other. One big advantage of Mattermost is that it does not require a smartphone to use it. Furthermore, by employing a platform that is run by XR and used across all international groups it is both robust and secure, and enables the local, regional, national, and international chat channels that a user chooses to follow to all appear in one place.

Working and organising groups will probably be using both chat and discussion.

Further Information

For further information about this important distinction please refer to this blog post.

Mattermost Moderation

What is Moderation, why do we need it and who does it?

These questions arise with any open chat service like Mattermost, and we have to have guidelines on what is acceptable. Sometimes, posts can get heated and hurt people's feelings, so some sort of feedback and, possibly, corrective action, is necessary. That's what Moderation is all about - keeping the posts within agreed limits of acceptability for all our users.

So, who does it? Well, we're a Self Organising System and, like it says in the Online Behaviour Guide: "We owe each other a duty of care to make our presence on our communications platforms a comfortable and beneficial experience." Maintaining good behaviour falls to all of us, and we need to be careful to maintain this when starting or responding to a post.

Now, there will be times when you may find a post that fails to meet what you feel are acceptable standards. You may, of course, decide to reply to it directly yourself, and explain why you find it unacceptable - possibly suggesting, to the poster, a potentially more acceptable way of making their point. Alternatively, you might bring it to the attention of the channels's Team Admin(s) by Direct Message - you can find their usernames in the Channel Member drop down list.

However, there will sometimes be a need for more formal oversight, particularly with channels like Town Square and Off Topic, where greater numbers of members congregate and more diverse topics are discussed. This is where our own UK and Regional Moderators can help. Their objective is to basically keep an eye out for posts which may not be appropriate either in terms of content, wording or subject. Our Moderators are members of XR UK and have previous experience in looking after spaces like Mattermost, so you're in good hands. In order to moderate fairly, they will act anonymously - that is, they won't use their normal Mattermost username, but a special username containing the Moderator term, like @UKModerator3. This will allow our Moderators to be able to use MatterMost as ordinary rebels themselves , avoiding any interaction with other users being constrained by knowing they are Moderators, and helps to protect them from personal harassment or entreatment to restore edited/deleted posts.

Moderators will be able to edit and/or delete any posts they find unacceptable. Users will be warned if their posts are in conflict with our criteria for acceptability and, in the first instance, be asked to rephrase the offending post and, possibly, to refrain from continuing with the topic. If this is not possible, because the original poster refuses - or the post itself needs to be removed - then the post will be deleted. On edit or deletion, the reason for this action will be published, by the Moderator, in the channel. Further discussion on this action, or the post itself, will be limited by the discretion of the Moderator/s. Hopefully, the issue will be resolved amicably and an agreement reached by all parties. However, continuing the discussion may result in further a warning and/or subsequent action to bring the matter to a close.

As stated above, applying the moderation function is not a means to control discussion, but to make our chat space as comfortable and acceptable to everyone in it. There will be problems but, with supportive and constructive moderation, we will achieve this aim and minimise disruptive and negative behaviour in our Mattermost channels.

How to download and use the Mattermost App

XR's Mattermost is held on our own secure servers and the address [Server URL] is

  1. Go to Playstore [Android] or App Store [iPhone]
  2. Search for Mattermost
  3. Select the Mattermost app - if you see several options e.g. Mattermost, Mattermost Business, Mattermost Classic or Mattermost Beta, select the one that either only says Mattermost or Mattermost Business. Mattermost Classic is for older phones and Mattermost Beta is for testers.
  4. Once the app has been downloaded, open it and you'll see the Welcome screen. If you want to learn more, select Next and scroll through the screens. If you want to sign in straight away, select Sign in. The Sign In screen looks like this:

Mattermost let's connect to a server screen

  1. Add in Enter Server URL
  2. Add anything you like in Display Name - XR makes sense
  3. Select Connect

    Next is the Log In to Your Account screen Mattermost log in to your account screen
  4. Add your login details and then select Log In. The more Teams, Channels and therefore messages you have, the longer it takes to load all that data to your app - be patient.

Once logged in you'll see this screen