Swipe up from the bottom of your screen. If you do not see the AirPlay or Screen Mirroring option, this is usually because Bonjour is not permitted on your network, or you do not have access to the same network as the ActivConnect or ClassFlow Connect device. 

The solution is to download and install ActivCast from the app store. This app will allow you to connect securely using a QR code, or a connection ID and password.