Honda FourTrax Rancher TRX420FA5 2019 Owner's Manual page 90

Shifting Gears
Drive mode select (AUTO/ESP)
The drive mode select switch (1) is located on the right handlebar.
To select the drive mode, release the throttle, then slide the drive
mode select switch to the desired position. With the throttle fully
closed, the drive mode can be changed while riding.
RIGHT HANDLEBAR
AUTO (automatic
shift mode)
(1) drive mode select switch
Gear Position selection AUTO (D/N/R), Manual (1-5/N/R)
Two gearshift switches are located next to the left handlebar grip:
Upshift ( ) and downshift ( ).
To shift between a forward gear (D or 1), neutral (N), or reverse (R),
bring the ATV to complete stop, and press a shift switch to select gear
position.
Select neutral (N) when you start the engine, or if it is necessary to
stop briefly with the engine idling.
The gear position indicator shows "N".
80 Basic Operation & Riding
ESP (manual
shift mode)
(1)