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Instructions in how to connect your devices to an Apple TV
AirPlay video from your iPhone or iPad
On your iOS device, swipe up from the bottom of the screen and tap Screen Mirroring.
Select your Apple TV from the list. If you don’t see your Apple TV, make sure that your iOS device is connected to the same Wi-Fi network as your Apple TV.
If an AirPlay passcode appears on your projector, enter the passcode on your iOS device.
To stop mirroring your iOS device, swipe up from the bottom of the screen, tap Screen Mirroring, then tap Stop Mirroring. Or press the Menu button on your Apple TV remote.
Mirror your Mac display
On your Mac, click 
in the menu bar at the top of your screen.
Choose your Apple TV. If you don’t see your Apple TV, make sure that your Mac is connected to the same Wi-Fi network as your Apple TV. If an AirPlay passcode appears on your TV screen, enter the passcode on your Mac.
To change the size of your desktop mirrored on your TV, click in the menu bar. Then select Mirror Built-in Display to match the size of your desktop or Mirror Apple TV to match the size of your TV.
AirPlay also lets you use your TV as a separate display for your Mac. Just click in the menu bar, then select Use As Separate Display.
To stop mirroring or using your TV as a separate display, click in the menu bar, then choose Turn AirPlay Off. Or press the Menu button on your Apple TV remote.