Click the bullhorn icon at the top of the page @chipwich .
Then use the “connect” button in the lower right of the page that pops up when you click the bullhorn icon.
This will send you to a page with an invite to join the Mudspike Discord channel.
You can use that invite to create your Discord account or login to Discord if you already have an account.
There will also be a page/form during the registration process that allows you to secure the account to an email which will send a confirmation link but that should not be something new for you since you have joined one or more forums. 
Wheels