Really? I'm practically braindead when it comes to computers and cameras and had to have someone walk me thru it so my explanation may not make sense.
On my photobucket page, when i scroll over any pic, it gives 4 "link options", 1st is email and IM, 2nd is direct link, 3rd is html code and the 4th one is img code. Just highlight and copy and paste the img code into your post and you should be good to go. If your photobucket page is different then mine and you dont have those link options, i'm sorry but i dont know any other way.