I think ChronoSuit is talking about a signature. To be honest, I'm no sure how you put those on there. A sig artist on dcemu made me a Kingdom Hearts 2 one, and I'm still trying to figure out how to put it on there. I copy and paste in the edit signature screen under User CP, but it always comes up as a link. Anyone know how?
It's an added bonus for premium members, along with a 90x90 pixels avatar like mine, as well as a big list of other benefits. Basically it's a system set up to offer some "goodies" to those who support the site for a nominal ammount of $1 per month.