In the box where you post your reply, look above in that grey area. There's a paperclip thingy next to that smiley face. Click on the paperclip and browse your computer to find pic you want. Then click upload. Then click paperclip again and it should appear in the reply box. When people click on it, it will come up larger. If you want a big pic to appear then you need to upload pic to a website like Photobucket and get the IMG or URL code/address and copy and paste that in the reply box. Hope this helps.