How to Use Apple TV

Click Control Center  in the menu bar in the top right of your Macbook, click the Screen Mirroring icon ,  then choose your Apple TV. 
 
 
 
 If asked, enter a four-digit code on your Mac. 
 
 
 To set whether your desktop mirrors or extends your Mac screen, click the Screen Mirroring icon  ,  then choose Mirror Built-in Display or Use As Separate Display.