Save them from photobucket onto your photo stream. You can then upload them into albums on your Profile Page by choosing them. Won't work on earlier iPads but very easy in the 3.
I don't use photobucket, but it ought to work with okay.
Generally I don't save photos to post, just copy & insert in the [IMG] icon (yellow postcard with stamp). Not as reliable in the long run, but I'm lazy.

Does this make sense? Not using photobucket or the App, I'm not fully addressing your question I realize.

Roadie