S_bastienBONDIL Hi~
1. Make sure your mobile phone is on the same Wi-Fi network as your Heyup Boxe.
2. Access the quick settings panel by swiping down from the top of your Android phone. There should be an option labeled Screen Cast.
3. Once you find the Screen Cast button, select it and then pick the device you want to mirror your display on from the list. It may take a few seconds for your phone to connect to the device, but once it does, your phone display will show up on the projector screen.