Well, when you're in Rome, the Romans don't need to know everything you do. :)

FTP the module to your cgi-bin directory. (Make sure you follow the directory paths for the leading bits of the module name though.)

So for HTML::CalendarMonthSimple, you'd make the directory /path/to/your/cgi-bin/HTML and FTP the file CalendarMonthSimple.pm to that directory. Then put this line in your code:

use lib '/path/to/your/cgi-bin';

That will tell your script to look for modules in this directory first. (Technically, it prepends the @INC array with this path.)