Use AirPlay. 1  Connect your computer and Apple TV or AirPort Express to the same Wi-Fi network. 2  Open iTunes. 3  Click to the right of the volume slider in iTunes. 4  You'll see this icon only when you have an AirPlay-enabled device on the same Wi-Fi network.hen an AirPlay-enabled device is available, you'll see to the right of the volume slider in iTunes. If you don't, try these steps: 1  Make sure that you have the latest version of iTunes and Apple TV software. 2  Connect both devices to the same Wi-Fi network.