Joining Usergroups
 

Is there a way to have a 'join usergroup' button that users can click, and they will be automatically added to the group? c:

Yeah add a mysql update on click.

I'd suggest usng ajax and doing something similar to...

UPDATE (users table?) SET (user_rank?) = (rank you want) WHERE (user_id?) = (user_id);

not sure of the fields, haven't touched the script for a long while ,I'm sure a post after mine will help your further.