This forum software is ancient, so it doesn't support this feature. There's a userscript that blocks the phpBB2 signatures, though.
^ Very smart of you. Here have your pirozhok: They just doesn't have any usefull info all the time and their only purpose is distraction.
First post: Complain about signatures. Second post: some funky fucking Ruskie food. Are you some irked lurk, or just appeared and picky about how forums appear?