Select on register sensor option. Scan the sensor using the screen circle to focus on the serial bar on the back of the sensor. If not able to scan, continue to bottom of the screen to type in the Serial (Top & Bottom) number on the back of the sensor. Hit done when this is completed.
Face the Blast logo towards the ground for two seconds, face the Blast logo towards the sky for two seconds, and repeat until it is activated. When completed, a Sensor Connected message will appear.