If it's not a voice remote, it doesn't require pairing. If it is a voice remote without a pairing button, press and hold the Home and Back buttons (the two buttons below the power button) for 5 seconds until the green light on the remote starts flashing.
If it's not a voice remote, it's an IR remote. You can verify whether an IR remote is transmitting anything by pointing it at a digital camera like the one in your phone. Press a button on the remote and you should see a flash coming from the end of the remote on your camera's screen.
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