Forum:Adding Images

I'm Will, and new to wikia. Trying to contribute to the Calvin and Hobbes wiki, but when I tried to add a picture I ran in a problem. The pop-up comes up like it should, but it's just a white box. It looks like I can type things in it, but it doesn't show what I type. Here's the link: http://calvinandhobbes.wikia.com/index.php?title=Calvin_the_Frog&action=edit. Do I need to install a program or something? Thanks for the help.

Will the Wanderer 22:07, September 12, 2010 (UTC)
 * To add a picture, go to special:upload and follow the instructions -- Random Time  22:29, September 12, 2010 (UTC)