Did you add [IMG][/IMG] tags to the code you picked up from photobucket? All you need to do is pick up the third line of code and paste it here. You don't even need to use the image icon in the edit window -- photobucket does it all for you.
See the difference? I used just the photobucket line both times, and for the first one, just pasted it directly into this message. For the second one, I used the image icon above, pasted the line there. That added an extra set of [IMG][/IMG] tags. Doesn't hurt anything -- it's just less tidy, and with photobucket unnecessary.