When you add it to your gallery, be sure and check the place where it says to allow public embedding. Then, after you've added the picture to your gallery, go back in and on the right side, you will see a button that says "embed". Click that, and then you will see a box that comes up with a code to copy and paste. Be sure and click the "image" code, and then copy the code. Then come back to the forum, and paste that code. It will bring up your picture.