Engadget
How to AirPlay from iPhone or MacBook to your TV

AirPlay functions when the TV and iPhone, iPad, or MacBook are on the same Wi-Fi network and the TV’s AirPlay option is turned on in its network or HomeKit settings. iOS users tap the AirPlay icon in apps or use Control Center’s Screen Mirroring; macOS users enable AirPlay in System Settings and choose the TV from the AirPlay menu. Connection frequency can be set to Automatic, Ask, or Never.