1. Go to the User Control Panel (in the yellow area at the top of the page where you can search).
2. Click the "Profile" tab.
3. The 2nd tab down is "Edit Signature". Click on that.
4. In the large box, write what you want your signature to say, use an image (from photobucket or the like), add a ticker (
http://www.tickerfactory.com).
5. Preview and tweak until you like it or its the proper size (it will tell you if it is too large).
6. Submit, and it will automatically show up on all of your posts.
Have fun!