If u have SSH (telnet) access you should be able to install them using the CPAN module (see http://www.cpan.org/ for details)
If you have Webmin installed you can do it through the GUI.
The thing to watch out for with Perl modules is dependencies. A lot of modules require other ones to be installed before they'll let you install them. Sometimes the error messages aren't very clear, but if you persist you should be able to manage it eventually.