lol, i have no pc so i cant do it but ask mods too but i know how. get rom picture you want by tap and hold to save immage to ppc, upload immage to imageshack or whatever you use then use your pc to fetch it and use usrcp on site to edit sig. does that sound right? i mean do you understand that? hold on, bigd has a thread on how too if i dont make sense.
http://forum.ppcgeeks.com/showthread.php?t=55098 here ya go.