Yesterday, I created a usergroup for A.T.T.A. The scrolly name is temp place holder till I can get around to making a new rank image for them. Just trying out something a little new. So nothing to really worry about.
If you are a member of that guild, go to your userCP then click on group memberships to add yourself. If you aren't a member, don't bother. Their clan leaders are doing user approval, so they know who's in the clan. They have the right to reject any non-members.