1 - On your iOS device, swipe up from the bottom of your screen to open Control Center.
2 - In Control Center, tap Screen Mirroring, then select your Apple TV from the list.
3 - Don't see your Apple TV or AirPlay-enabled device? Try connecting your iOS device to the same Wi-Fi network as the device you want to AirPlay.

1 - To set up Chromecast, all you need is a TV with an HDMI port, a Wi-Fi connection and either a computer or a mobile device with Google's Chrome browser.
2 - Simply connect the Chromecast to your TV's HDMI port
3 - Visit chromecast.com/setup on your PC
4 - Download the app and follow the instructions from there.