You can either go over to our Tech board or I can try to help you out.
First you must have a piece of clipart that you want to use. Then you need the url address for it.
Second you will need to go to your profile and go to the area where your signature is. Add the url for the clipart into your signature profile and save the changes. Then your clipart shoudl show up--but make sure the box is checked when you reply to posts to include your signature.
I hope I have helped, if not, please feel free to try out our tech board. They have LOTS of help over there.
Sue Ellen