Make sure your Mac and AirPlay device are on the same Wi-Fi network
Open the app or content you want to AirPlay
Click the AirPlay icon if it appears in the app
If using a video, look for the AirPlay button in the playback controls
Select your AirPlay device from the list
Enter the AirPlay code if prompted
To mirror your Mac screen, click Control Center in the menu bar
Click Screen Mirroring
Select your AirPlay device
To stop AirPlay, click the AirPlay or Screen Mirroring icon again
Select Turn AirPlay Off or Disconnect