Greg,
You can't change permissions with server-manager. You have to use an ftp client such as wsftp. use the ftp program to connect to your server, and navigate to the cgi-bin folder. Use the controls of the ftp program to change permissions on the file/folders.
The methodes of doing this are basic to the use of ftp, and linux.
If you are not familiar with linux, as we all were at some point (and in many ways I still am) check out a linux newbie site to get a little feel for how to do things with linux. Keep in mind that this is a very customized version of lunix, and you can't do everything the way they say for most distros. Most everything can be accomplished, just in a different way.