For information on how to attach it on your dashboard or windshield correctly, consult the manufacturer.
Before you start driving, that the dash check twice that the cam is correctly wired to the power supply and turned on.
Set the it’s settings, including the resolution, frame rate, loop recording, and other functions, to your liking.
Make sure the memory card is properly inserted into the dash cam before driving.
Check it’s display or indicator lights to ensure that it is recording properly.