Depending on the camera you use, you can adjust your camera by manually opening or closing the lens cover, focusing, and configuring the camera.
To adjust the camera focus:
>> To adjust focus for most cameras, turn the dial on the camera.
Typically, you can turn clockwise to sharpen focus on far objects, and turn counter-clockwise to bring close objects into focus.
Caution: Turning the dial too far either way may damage the camera.
To configure your camera (if a configuration page was provided by the camera vendor):
To prevent the far end from seeing you:
>> Close your lens cover if your camera has one.