I've just had a look at photobucket. If you click on the image you want to share there are 4 sharing buttons top right (facebook, twitter, e-mail and "share to other services") Click the "share to other services" button and click the "links tab." IMG code for forums is the one you want.
I use flickr which is much easier!
The quote feature Geoff mentioned was the menu option top right of each post. (Quote, Modify, Remove) rather than the quote icon above the message box. You can click quote (from top right) to see each post in code form - useful if a post contains fancy formatting you want to use!