If you are already signed in, place your mouse over My Account above the main navigation and select My Equipment.
You'll see the receivers you have in your DIRECTV® System. To order additional receivers, click Upgrade/Add Receiver.
Note: If you're next to your TV, press and hold down the INFO button on your remote for a few seconds until the Info & Test screen appears. You'll see your receiver's model number in the "Receiver" line.