When you are in your photo album. and you select a photo there are several "boxes" above the photo (Facebook, Twitter, Google+, etc. One of the boxes looks like a chain link. If you click that box, a pop-up window appears with a bunch of link codes. The bottom one says IMG code. If you copy & paste that entire code into the thread post, you'll get the pics in the thread like I have. Works on all ProBoards forums.