The usual way (on other forums) is to make your sig in a graphics program, PaintShop Pro for example, and upload them to your site and paste the url into the signature box in your profile. Some forums allow you to use SWFs, which can be made using Flash, Swish or a number of other programs. You can, of course, use animated gifs as well. Not sure what this forum software allows though.
EP, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS