If you know how to post photos with Photobucket... click on Your Preferences. In the box marked Signature you can post the url from Photobucket. That photo must be sized as a thumbprint..160X120.
When you post, click on Show Signature, below the box you are typing your post in. You can click on Preview before you reply to Topic, and the preview will show you if things are posting right..
If you don't know how to post photos through Photobucket, that's a whole new ballgame. BUT, it's not impossible. Just let me know and we can start from square one and walk you through the process.
Most folks are as happy as they make up their minds to be.