WCF...
Go to userCP, the click edit profile. In the signature spaec, you need to use the image tags around the url of the picture...
like this [ img ]http://www.wherethepictureis.jpg[ /img]
only without the spaces...and of course substituting the address of the real pic for "wherethepictureis.jpg"....
posting it here was fine! Any other questions...or if you need more help...just let me know!