To start you simply hold the chain of the pendulum between your thumb and forefinger. Holding the pendulum in your chosen hand, run your other hand down the length of the pendulum chain to steady it, and rest the bottom tip of the pendulum in your palm. Move your hand away from the bottom of the pendulum. As you move it away, the pendulum will start moving.
Ask your pendulum to show you a YES response. Your pendulum will either circle around or swing back and forth in a straight line. Whichever way the pendulum moves for YES means the other direction is the answer for NO.