Rookie - post your question to the date of birth stickie thread, instead of burying it in this one, and you'll have better responses.
Pictures are posted by linking the url information from the hosting website. THR does not host pictures, so you can't just upload them from your computer. Instead, you have to have a server hosting your pictures. There are plenty of free sites that do that - I use photobucket. Once you have your pictures on a server, then you can use the system's img posting feature to post your picture. Just click on the tiny picture button above the message entering window, enter your url, name it, and your picture should show up.