1) With the scooter turned on, hold down the Menu & Power buttons at the same time.
2) The setting P0 will come up, which controls the setting for mph / kmh.
3) Press the Power button to edit settings
4) Toggle to "1" using the Menu button to change to Mph. Or, toggle to "0" to change to Kmh.
5) Press the Menu & Power buttons at the same time to exit set up mode.