You can use Apple Watch as a remote control for an Apple TV through Bluetooth®. You can also use Siri to start watching something.
If your iPhone has never joined the Wi-Fi network that the Apple TV is on, join it now, then follow these steps:
Go to the Remote app .
Return to the main menu: Tap , then tap Captions.
Turn Apple TV on or off: Tap , then tap TV Remote.
Go to the Remote app Use Siri on Apple Watch