This option is only available when running an unregistered retail license. When you purchase MaxIm DL from a dealer, a temporary license is supplied that works for 30 days. During that time, you must register your software so you can receive your permanent license. The permanent license is not locked to any particular machine.
Simply click this menu item to start your default web browser and navigate to the registration page. Fill in the required information, and you will be automatically registered.
If you have trouble registering, please contact technical support at http://www.cyanogen.com/techsupport.php.