It's free to join and simple to use. Once you've uploaded the pic to that site, copy the URL of the pic from the site and then in a post, hit the URL button, paste the URL, hit enter, type in a name for the pic, and hit enter again. It's easier than it sounds.
step 1: upload it to photobucket
2: copy the image url at bottom (not the url at the top in the address bar)
3: come here and press the little box that says image. paste the image url in the box that appears and press ok.
4. post your topic and the image should appear when the topic you posted appears..