@chris.peck Look here, the guy has described the calibration process in his article.
The steps are (copied from the article above):
Calibration is very easy. Click the “up” and “down” buttons simultaneously for 3 seconds, until the blue LED comes on. Then we put the blind in completely open position, using the “up” button, stop it and confirm it by pressing this button 5 times. The blue LED will flash 3 times.
We lower it until it is completely closed and confirm again by pressing the “down” button five times. There should be 3 flashes again.