changes to perms and disabling forum

According to the july'08 ebm, I've granted the perm:

Created a new group called "))DocContributors(("

I've removed the perm tiki_p_post_comments from registered, and granted it to DocContributors

I've added to the group DocContributors already a few registered users among the ones that edited pages in the last two weeks (as a trial). But I wonder what will be the process to add more people to this group...