First, make sure it has two AAA batteries. To pair, press and hold the Confirm and Back buttons together for 3 seconds until the indicator light flashes.
On the G2, go to the device settings, select 'Portable TV' from the Bluetooth list, and click to pair. The light turns off when it's successful.
If it doesn't pair in 30 seconds, it will time out. Just press the key combination again for 3 seconds to retry.