Actually, the Mods are Insane Steve, Dr. Mario, Marionut#1, and Fifth. Oh yeah, and David Dayton, I think.
You'd probably want an admin (administrator) b/c they have more things they can do. The admins are Deezer, Megabyte, Chupperson, LD, Watoad, and me. Yeah, you'd definitely need an admin to help you... *Sapphira steps up to the plate*
Anyway, I think Deez said that the registration stuff on the forums is basically dead, or something like that. If no one can register, it wouldn't surprise me that you can't change your sig.
If you can tell me what you'd like your sig to say, I might be able to find a way to directly change it.
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Wise men talk because they have something to say;
fools, because they have to say something.