Yes, Almost-Good, you did say the same thing. Thanks for helping!
For anyone who ever has the same problem with a script, here's what I found out:
Our CGI server's name is your URL (you were right Elijah).
In researching CGI server names, I found out sometimes a host might use
http://cgi.hostname.com , the URL without the http:// , your domain, or anything else. This differs from host to host.
The reason why I couldn't get the CGI server's name (my URL) to work, is because I did have another mistake (as I suspected). A specific file needed to be in the same folder as another part of the program. Unfortunately, the Readme did not say anything about this. As it was in the wrong folder, it appeared that my program couldn't find my location.
Thanks to everyone for their help!