Go to your Photobucket account. On your home page, just below the green block that says "Upload Images and Videos" is a line that says "
Tip: Hold down
CommandCTRL to select multiple files.
(more options)". Click on the "more options" section and select the " 15" screen ( 800 x 600 ) " setting, then scroll down to the bottom of the page and save that setting. Once you do that all of the photos you load to your account will be resized to that setting. It produces a decent size picture that's user friendly to just about all forum members.