Some servers don't like extra periods and commas in filenames. I would suggest renaming the files into something simple, image01.jpg for example. Photobucket allows you to upload directly from their website, so there's nothing else to do except find the file on your local computer and upload it. Once uploaded, Photobucket provides you with all the common HTML based code for linking your images, its a simple cut and paste from there. The FSM forums use the bracket/img format.
Hope that helps,
Jeff