Registered Name: This is the name that the license was created for. This should be in your confirmation Email, and is required. This value is case sensitive.
License Key: This is the license key provided in your confirmation Email. This must be entered exactly as appears in you confirmation Email.
OK: When the registered name and license key are entered correctly, clicking OK will test the key to make sure it's correct, and then apply this license to your installation. The licensing information dialog will then reflect your new licensing information.
Cancel: This cancels key entry and makes no changes to the currently installed license.