Try this from bigfootleveler.com:
Operation Instructions
Set-up #1: Programming Your Sensor
1. Turn panel OFF, press FRONT 10 times, then press REAR 10 times.
2. Follow the instructions on the screen for selecting ONE sensor using the arrows on the
left side of the panel.
3. Place a carpenter’s level on the inside of your trailer (countertop, refrigerator or floor).
4. Manually operate by pressing FRONT, RIGHT, LEFT & REAR buttons to get the trailer level
from front to back and side to side.
5. Once level in both directions press ENTER. You’re done.
From this point forward when you press AUTO LEVEL your trailer will return to this position.