Electronic Registration PLEASE NOTE: Electronic Registration is for customers in the United States and Canada ONLY. There are two ways to access electronic registration. A. Select "Yes" when asked to Register during the installation process. B. Register from the Call of Duty: United Offensive Launch screen. 1. Insert Disc 1 of Call Of Duty™: United Offensive™. 2. When the title screen appears, click "Support". 3. Click "Register" and follow the onscreen directions.