When you open up the advanced window, there is a paperclip just to the right of a white smiley face. Hit the paperclip, add your picture from your computor, after it loads, close the window. Then hit the paper clip again, and left click your picture and it will add it to your post. After you open up the paperclip, hit the browse button to add your picture, then upload it. But look at the size of your file, as there is a limit to the size you can post.