to put a pic in your signature, first the picture has to be on a website..it can be in the gallery here. then u need to go to that web site, say the gallery...right click ontop of the image u want and hit properties. there u will see the URL. highlight that URL and right click. hit copy. then go onto "my controls" at the right top of the page. then click edit signature on the left. there u will see a window similar to the ones for posts. click the IMG button. a pop up window will appear. erase the http:// in that window b/c what u will paste will already have that. then right click and paste. then hit ok. then click update signature, and that should work!
to have a changing avatar or signature most people use photoediting programs like adobe image ready. if this isnt ur area of expertise, I and many others can help u out. i have made many people's signatures and changing avatars. just pm me and i can help ya.
by the way u r not think...i usually find it easier to explain on an instant messenger type setting and thats how i helped malt lover. if what i typed makes no sense we can go that route too