After you have connected to your Network Solutions Hosting package with the FTP client of your choice you will be placed into the root directory. Within the root directory you will notice two sub-directories:

/cgi-bin
/htdocs

The htdocs directory is your "web root"; files placed in this directory (like your index.html file) will be viewable when people visit the URL for your domain.

The cgi-bin directory is used for any Perl scripts you might have.