Click the "Activate" button. You must be connected to the internet for this initial authorization.
Members of the USBGF (U.S. Backgammon Federation) or GammonSite often qualify for a 20% discount on their first activation. Step-by-Step Activation Process Extreme Gammon Activation Key
In the registration window that appears, copy and paste your activation code exactly as received. Click the "Activate" button