OK, I've seen way too many failed attempts from people attempting to use UBB code for their signatures.
If you have a URL to a signature (an image under 500 pixels wide by 150 pixels tall), click on the "My Profile" link at the top of the forum.
Then, under the "Signature" field, type in:
Code:<IMG SRC="url_to_your_signature">
Replace url_to_your_signature with the http:// url of the image you want to use.
