Now to operate in menu you can use the left and right arrows to pick spot to change. Then up arrow increase the value of picked spot. To change service screen you have to press up and down button at one time.If you have changed values and want to save it, press and hold left and right button for 2 seconds (to be sure you could do it twice). WARNING! Unsaved changes will not be applied.Second screen is changing the mileage of locomotive: