If you go to the top of the screen and click on FAQ, there is a detailed explanation.
Basically, you need to put your pics on an online host. I use hunt 101, it is free:
http://www.hunt101.com/index.php Then you put a link to your photo as described in FAQ and that's it. It will seemed complicated to me when reading the instructions, but I fumbled through it and it is really pretty easy.
Good Luck, MM