How do I reset the clock on the LCD screen on my Elegant

The latest revision of VoltBike Elegant ebike comes with color LCD screen 850C. To adjust the clock on this screen you need to enter the parameter setting mode. Double pressing power button in interval less than 0.3 sec. will get you into parameter setting mode. From here you can set various parameters like wheel diameter, clock, brightness, switch km/h to mph etc. mp/h