Honda TRAIL 125 2022 Owner's Manual page 26

Instruments
Changing of speed and mileage unit
Turn the ignition switch to the ON position.
a
Press and hold
b
Press button to select either "km/h" and "km" or "mph" and "mile".
SEL
c
Press button.
d SET
The speed and mileage unit is set, and then the display returns to the ordinary display.
The speed and mileage unit can also be set by turning the ignition switch to the OFF position.
u
22
(Continued)
button and button.
SEL SET