If anyone's curious, I'm the only group admin who's actually done anything in this group since 2011. I only have the ability to vote in submissions, I can't make new folders for new members, or rename the folders for users who have changed their usernames, or approve new members.
As I said in a comment below, I did once note the group's founder about this issue - if they weren't going to be active in the group at all, could I at least get some extra admin privileges - but she never responded.
If you'd really like to join this group, or get your folder renamed, PLEASE send a note to the group Founder (listed above). Otherwise, I strongly suggest you just forget about this group and join one of the many others. There are tons of really great stock groups here on dA where there's more than one active admin, and all the admins have the power to do more than vote deviations in.
But I think most of the existing group members figured that out a while ago, since we barely ever get submissions here anymore. I'm still here, voting in the few submissions we get, though.
And now I've said my peace. Thank you.