The headlight adjustment screws are located behind the light fairings at the bottom of the fittings on both sides.
They can be adjusted with a Phillips head screwdriver.
To adjust each side, simply turn the handlebar fully to the opposite side of each screw.
Winding the screws in, i.e. turning clockwise, lowers the headlight beams for both low and high beam.
Winding the screws out, i.e. counter-clockwise, raises the headlight beams.