Once the pic's are at photobucket you can copy and paste the IMG code(4th option below the pic when you place the cursor on the pic your selecting) into your post a reply page. It will appear as a code. Click on the Preview button to see if it worked if you can see the pic then your all good an you can submit post.
If you'd like a better description check out the 7th post in this thread by jscott. He posted a great reply on posting pic's complete with visuals. [ Invalid URL Removed / p= t=89823 f=1 ]