When you post pictures from Photobucket, all you do is double or triple click on the IMG tag line under your picture. It will say "copied" in a tiny window.
Then move to your post editor over here, and click paste. You don't need to add IMG tags at all, as Photobucket pastes them on automatically.
Always hit Enter a couple of times after a picture or your text so that the images line up properly on the left.
Once you've got your post typed up, click Preview to see if the post is displaying properly with all of your images.
Hope that helps; thanks for sharing.