Checkout this video:
Open the Control Center.
Swipe up from the bottom of your iOS device’s screen to open Control Center. You should see a button that says “Screen Mirroring.” If you don’t see this button, it’s probably because Screen Mirroring is turned off in settings app
Tap Screen Mirroring.
2.Open Control Center:
-On iPhone X or later, or iPad with iOS 12 or later: Swipe down from the upper-right corner of the screen.
-On iPhone 8 or earlier, or iPad with iOS 11 or earlier: Swipe up from the bottom edge of any screen.
3.Tap Screen Mirroring.
4.Select your Apple TV from the list.
5.If an AirPlay password is required, enter it on your iOS device.
Select your Apple TV.
From the Home screen, swipe up from the bottom of your screen to open Control Center.
A list of available devices will appear. Select your Apple TV from the list.
Open the app or video that you want to share.
start mirroring your device, you’ll need to open the app or video that you want to share. For example, if you’re mirroring your device’s screen, you’ll need to open the app that you want to share.
Once the app or video is open, do the following:
– iPhone, iPad, ipod touch Swipe up from the bottom of your device’s screen to open Control Center, tap , then tap .
– Mac: Click in the menu bar at the top of your screen, then click .
– Windows 10: Select Start > type connect > select Connect from the list of results.