Ok your picture is on photobucket. now when ya goto photobucket and look at the pick get the img code and past that in your signature section of your account settings. that should work.
ok on the my gaia page ya have a tab that looks like a (gear)... Ya knwo where ya have the house and car and fishtank tabs. well goto the gear which ius the account settings, there is little menu that will scroll down with the arrow next to the gear. there you will find signature.
ok every picture on photobucket has 4 different type of link options
1. email
2. direct link
3. html code
4. image code
the link you are showed us was the direct link, you want the image code.... if ya scroll over the picture on photobucket the bottom share option should be image code.