The Hub, Mattermost, Cloud and Forums

The XR supported tools we use to communicate with other XR rebels.

Start Here

This document is a quick guide to get you started with using XR's UK online communication tools for the first time.

In this guide, you will learn:

  1. How to set up an account on the Hub.
  2. How to log in to Mattermost and send a message to your XR group in the UK.
  3. Find out where to find more information.

Note: This guide assumes that you will be using a desktop computer, although if you are using a smartphone the steps should be the same. You can use either your smartphone's browser app (e.g. Chrome or Safari), or you can download the Mattermost app. For a guide on using the online tools with a smartphone, please read this page.

Note: If you have any trouble with this guide, please contact your XR group's group admin. If you don't know who this is or if your group doesn't have one, then please email

If you need support with:

please join one of the weekly sessions:

Mondays 17:30–18:00 (quick questions)

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

Join Zoom Meeting

Meeting ID: 895 2855 8324 Passcode: 278766

Or post queries or problems in the Hub Help Desk channel on Mattermost.

1. Joining the Hub hub.png

What is the Hub?

The Hub is the key to accessing all of XR's UK online tools. It does two main things:

  1. When you join the Hub you will automatically have accounts created for you (with the same username and password) on all of the main tools that we use (including Mattermost).
  2. The Hub acts as a phone directory – you can use the Hub to find and contact other groups.

For more information on the Hub, please read this guide.

How do I join the Hub?

To sign up to the Hub:

  1. Ask the group admin of your XR group to send you an email invite to the Hub.

  2. Open the invite and click on the link (you may need to check your spam folder). This will open a webpage containing a form that looks like this:

  3. Fill in the form with your name (this is visible to other users, so you can use a nickname if you like), phone number (optional) and password. You are encouraged to create a username that is recognisably related to you - some rebels are happy to use their Local Group as part of their username – like tom-bangor – while others may align with their Working Group – like rose-creatives. However, should you wish to remain anonymous, you are free to choose a username that totally conceals your identity.

  4. There is a list of groups you have been invited to. You can choose whether or not to reveal your phone number and/or email address to members of each group.

  5. When you are done, click Confirm.

If you don't know where your local group is, there is a Map. If your local group doesn't use the Hub, perhaps you could encourage them to do so - the Local Group Support team would be happy to help. Contact by email


This video takes you through the steps outlined above. Or if you already have a Mattermost account but not a Hub account, watch this video instead.

Any problems?

If you are encountering any issues, read this page for information on how to fix the most common problems, as well as where to go to ask for help.

2. First steps on Mattermost Mattermost-icon-small.png

What is Mattermost?

Mattermost is a secure chat application that your group can use to communicate instead of using a program like WhatsApp, Signal or Telegram. It can be used both on a desktop computer and a smartphone.

The main advantage Mattermost has over other chat tools is that it is MUCH easier to get in contact with other rebels. Most groups in XR, both in the UK and globally, are already signed up to Mattermost and it is simple to find and message them. Because Mattermost is used by XR Global, you can even get in touch with rebels across the world!

Please watch this video for a general introduction to Mattermost and its benefits.

Getting access

  1. Navigate to Mattermost in your browser. You can do this by either clicking on the Mattermost button from the Hub home page or by going to Searching for Mattermost in your search engine will not work - you will just find Mattermost Inc. in the USA!
  2. Enter your username and password set up when signing up to the Hub.
  3. Go to your email inbox, open the email you just received from XR Global (you may need to check your spam folder) and click Verify Email.
  4. Go back to Mattermost (a new window should have been opened), re-enter your password, and click Sign in.
  5. Bookmark this page. This will make it much easier to find in the future.

For a video guide through these steps, see here.

Mattermost basics

Once you have successfully logged in to Mattermost, you should see a screen that looks like this:


On the left-hand side (5) are the public and private Channels that you are in. When clicking on the Channels, note that the messages shown on the right (15) will change.

Below the Channels are your Direct Messages (6). These are private conversations that you can have with individuals or small groups of up to 6 people.

If someone replies to a message you posted, or are following, the Threads (4) will light up - click here to see the replies.

At the far-left of the screen (1), you may see two or more blocks. These are Mattermost Teams and can be used to group Channels together. If you navigate between the different Teams, notice how the Channels shown change.

For a more detailed guide to using Mattermost, see this page on the Rebel Toolkit.

Sending your first message

To message your group for the first time:

  1. Find the correct Channel to post a message in. To do this, click through your Channels and Teams until you find a Channel with the same (or similar) name as your group.
  2. Write a hello message in the box at the bottom of the screen (16).
  3. Hit Enter to send the message.

3. Next steps

If you are interested in learning more, there are more advanced guides on the Hub, Mattermost, UK Forums and UK Cloud as well as XR's other UK tools.

We also strongly encourage you to read our Online Behaviour Guide.

Lastly, if you have any trouble at all with these tools, please contact your group admin. They are there to help!

Extinction Rebellion UK Privacy Policy

Extinction Rebellion UK Terms of Service

The Hub

The Hub

What is the Hub?

The Hub is the tool XR UK uses to connect lots of the programs (e.g. Mattermost and UK Forums) that rebels use to organise online.

Why do we need it?

The Hub does some really important things:

The Hub also keeps track of the structure of all the XR groups that have joined (see My Groups). This is extremely useful because it makes it really easy to find the right people to talk to.

How do I join the Hub?

To join the Hub, you need to follow the steps described here.

The Hub

Using the Hub: The Basics

This is the Hub home page. Here you can see links to many of XRUK's services. Click on any of the icons to go to them. Most browsers allow you to click while holding the Ctrl key to open the link in a new tab.

The grey area at the top contains links to training on the XR communication tools. If you already know all about the the subject, click "I'VE DONE THIS" and it will show you the next set of training. Once you have done them all, it will disappear (but you can get it back – there is a link at the very bottom of the page, if you scroll down).

Some of these icons only show if you are logged in to the Hub – click LOG IN in the top-right corner:

Admins will have extra options on this page, e.g. to invite other people to the Hub and XRUK's services.

Joining new XR groups

When you are invited to join the hub, or to join a new group on The Hub, you should get sent an email (check your spam folder if you can't find it). If you click on the link in the email, it will take you to a page that looks something like this:

Click the Create Hub Account button. You will see the following screen:

(If you are already on the Hub, some of this information will already be filled in.)

Notice the list of groups you have been invited to at the bottom of the screen. For each one, you can choose whether members of that group can see your email address and/or phone number. If you don't want to join one or more of the groups, you can choose not to accept the invite (by unticking the Accept box) – you will not be asked again (unless you are sent a new invite).

Simply fill in the form and click Confirm. You will be automatically added to the group(s) including all of its channels and forums.

It is also possible to accept your invites by clicking on Accept My Invites from the Hub home page.

Parts of the screen

  1. Hub logo – clicking here takes you back to the Hub Home Page
  2. Services – click here to go to the Services page
  3. Groups – click here to go to your Hub Groups
  4. Your menu – click here to drop down your menu (including your settings, help and logging out)
  5. Menu bar – all the options relevant to the current screen
  6. Menu bar overflow – if there isn't enough room on the screen for all the menu bar options, the extra ones will drop down if you click here
  7. Actions bar – all the options relevant to the current screen, e.g. Save or Delete

My Groups

You can see the groups you are in by clicking the My Groups tile:

Or select the GROUPS menu option:


This brings up a list of Groups you are in. Click on ALL GROUPS at the top to see all the groups, even the ones you are not in. Click on a group to show the group in context.

This screen is showing the Digital Discussions Applications Team UK Working Group. It also shows the parent groups (1) – click on one to go to it.

The Hub Circles display shows the group's Roles (2), and any child groups (3). This has a full-screen button to make it larger and easier to navigate (4). To find your way about the structure, you can click on any group to go to it, or on the background to go up a level.

If you want to find another group, you can use the search button (5).

You can click the Filter button (6) to hide some of the detail, to make the diagram less busy. If you set a filter, it is remembered and used every time you open this view.

You can also display the groups in a Tree View (7) instead of the Circles Display.