How to reduce the step length, I need to set it to 60cm but it starts at 80cm

The step length setting range:
  • Metric: Range from 30cm ~ 213cm; with setting at 1cm interval
  • Imperial: Range from 12inch ~ 84inch; with setting at 1inch interval
  • Default Stride: 30inch / 80cm
To change the value of the step length, press the RESET button to reduce the numbers and the MODE button to increase the numbers.  
You can see a video demonstration setting the stride length and all of the other features here:

Below are the instructions for setting the Stride Length and how to calculate your stride length: