You can contact the team who manage this web site via the email address on the home page, or post a message via one of these:
On Mattermost, the Rebel Toolkit Reception channel in the UK Team. It is a public channel, so you can join yourself to it.
On UK Forums, the Rebel Toolkit Reception forum. To see that forum, you need to join yourself to the security group "Rebel Toolkit [wg] Reception". For instructions on how to do that, see the forum post "3 Join Groups" in the "Help Info & Tech" category.
If you don't have accounts on Mattermost and the UK Forums, you need to get signed up to the communications Hub; ask the Tech Champion of your local group or community group.