It depends on what you want the picture for. If you are trying to add a picture to a thread that you started or are replying to then this how. In the box where you write in there will be a little paper clip. It is on the top in the gray part of the box, next to a smiley face. If you click on it a new little window will open up and you can browse through you photo library on your computer and pick a picture. Hope this helps!