How do you work built-in webcam i have no idea?

If you have an HP then go to HP Media Smart. Your HP should come with it. Once you bring it up you'll find the picture that says webcam. Click on it and it will bring up everything you can do with your webcam.

If you don't have an HP go to My Computer and do a search for webcam. A few things will come up click on them till you find the webcam. That's how I found out about HP Media Smart.