R.dAni!2009

I'm trying to set up a new mystery cache, but I need to upload pictures to the main cache page. How do I do this? I'm at the description box which says you can add pictures, but I can't see how to do it? The only 'Upload Image' box I can see is in the Admin Box and adds the photos to the Gallery and not to the listing/description itself on the main page. Any help would be greatly appreciated, thanks.