Bill,
It can be done, but it is a pain. Once you have your pic on photobucket, tap on it and then tap on "share". Choose "image links". Be sure to turn your phone sideways and then double tap the script in the message box. Choose "copy" and drag your cursor clear to the end of the line of script. Tap "copy" and you should have it captured.
Then come to tradgang, open your post, and tap and hold in the message box. When you let up, you should have the option to paste. Tap paste and you should have it.
Sorry for the long instructions. Good luck.