First - make sure your rangefinder is set to Mode 2. Look through the rangefinder and press the button until the display reads M2. Second - aim your rangefinder at the flag, instead of the stick. The flag is a larger target and by aiming at the flag, you also avoid catching objects in the background. Third - to lock onto your target, raise the rangefinder to your eye, aim at the flag, and press the power button. Your rangefinder will vibrate and display the distance to your target. Note: If the rangefinder is off, you will press the power button to turn it on, aim at the flag, and press the power button again. If your rangefinder still isn’t locking onto the flag after following these instructions, please contact our customer support team at support@blueteesgolf.com.