Make sure your MacBook and AirPlay device are on the same Wi-Fi network
Open the content you want to share on your MacBook
Click the AirPlay icon in the menu bar or in the app you are using
Select the AirPlay device you want to connect to
Enter the AirPlay code if prompted
To mirror your screen, open Control Center and click Screen Mirroring
Select the AirPlay display or TV
To stop AirPlay, click the AirPlay icon again and disconnect
If the AirPlay icon is not visible, go to System Settings and enable AirPlay or display mirroring options