I think that you can use this link 🙂 http://www.killermovies.com/forums/sigupload.php?s=
Okay, firstly you must save the image/sig as a JPG or JPEG file. Next when you go to the link above you click the "Browse" button. Then you find the image/sig then click "ok". After that, click "Upload sig". Then, you copy the link in bold that they give you, then click the link "profile", then you copy it into the sig area. 😄