(1) Go to the User Control Panel and click on Avatar.
(2) Delete any current avatar if there's already a picture in the box.
(3) Minimize the Avatar page.
(4) Go to Photobucket and click on your Avatar picture, and on the drop down select "Direct Link" (it turns blue) and copy it.
(5) Minimize the Photobucket page.
(6) Bring the Avatar page back up.
(7) Click on Link to Avatar
(8) In the box next to Avatar URL, delete anything in there so that it's a perfectly clean box (even delete the http://) then save the URL you copied at Photobucket into that box.