Go to user control panel, on the top of the home page.
Then in the Signature field place the url to your image inbetween
www.place url in here[/img) but use a ] at the end instead of the )
for example my sig picture is
.
[img]http://www.hardmvs.com/images/dedicated/6Slot5.jpg[/img
place the ] at the end of [/img
If I put it in this field it would link to the image.
If you dont have a host site email me the image and I will put it up for you.