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. 
                