From reading your post I think that you made a simple mistake but the help desk thought you were trying, and failing, to do something complicated.

By default your home page must be named index.html or index.htm

If your browser cannot find a home page at your address it then attempts to display a list of files. For security reasons Bravenet don't permit this unless you explicitly allow it using the .htaccess file (paid hosting only).

If you have named your homepage something other than index then the simplist solution is to rename it. Anything else involves doing things with your .htaccess file.