1. Go to USER CP (on top of your page)
2. EDIT SIGNATURE (CLICK THERE)
3. A Box with ur sig. of now will come up ERASE THAT.
4. click on this icon:
5. INSERT URL OF PIC/SIG WUTEVER U WANT there.
and your done. after that just click SAVE SIGNATURE on bottom. (dont forget to upload ur banner/pic first @ ************* or sumthing.
Hope it helps.