I have numerous people ask me how to do this and it can be a bit confusing until you "see" it. So...
Upload your picture to Photobucket or similar site (this will show you how to do this in Photobucket. That's what I use, so that's what you get.)
Use the Direct Link Option (It's the 2nd option) Clicking in the box will automatically Copy the link for you.

Make sure you resize the photo to the Preset size of Tiny Pic (it's 100x75)
Come to the board and click on Profile. Under Modify Information there is a link for "Forum Profile Information"
Then at the top you are going to have 3 options. You can choose a board graphic, "I have my own", or "Upload" (I have had NO LUCK with uploading pictures from my machine... so..

Choose "I have my own" and paste in your link (Ctrl-V or right click and Paste)
When you save your changes (at the bottom) it will update with your photo.
Easy, peasy, huh? Just gotta have the right link.
