1. Go to www.photobucket.com
2. Get a free membership
3. Download the picture you want to post to photobucket.
4. Copy the link underneath it that says IMG: [IMG] blah blah your pic [/IMG] (You don't have to write it. It's already there, just copy it.)
5. Paste the link when you post where you'll want the pic
6. Click Add Reply or Post New Topic so it'll send, and Viola`! You're done!