Go to User CP
http://img163.imageshack.us/img163/9752/usercp.gif
Scroll down to Settings & Options, click on Edit Signature
http://img577.imageshack.us/img577/7909/editsig.gif
Enter what you want in your signature
http://img163.imageshack.us/img163/1203/sigbox.gif
Save your signature, or preview to see how it looks before you save it.
http://img69.imageshack.us/img69/278...previewsig.gif