If I remember correctly, you go to the last blank screen on the display, like you are going to do Fob training, scroll to the blank screen, and hit options then select "tire training". it will prompt you to start at the Drivers Front and work clockwise to each tire. Take a strong magnet, I use a pickup magnet like for dropped bolts etc., and encircle the valve stem, pointing the magnet at the rim. Do this until the horn chirps for each wheel.
I may have the steps to get to the tire training screen wrong, I'll go and try it on mine and repost with better detail if so.
This is real easy to do, I'm sure others out there know this one too.