If you want to post a particular pic. Hover your mouse over the pic in photobucket, a box will open below it, the last option is an IMG code beginning with IMG In brackets [] and ending with /IMG in [] . Left click on the code to highlight it, then right click and select 'copy' then go back to your message and right click and 'paste' the code in.
When you submit the message, the picture will show up like mine did above.
Hope this helps!