Since register_globals is disabled on the servers for security purposes, some of your scripts and Fantastico installs might not work properly. However, you can enable it on your individual accounts through .htaccess
All you need to do is edit your .htaccess in the root folder of your account (or create one via the File Manager if none exist).
Place this line of code in it:
php_flag register_globals on
N.B. : register_globals" is a PHP Directive. This is no longer being used in the newer version of PHP and therefore has been deprecated. For more info about this directive, click here.