If you look on the plastic between the headlight glass and the metal strut you will find instructions on which way to adjust them. Arrows are impressed into the plastic. Very clear once you have found them.
Headlight aim is adjusted by 4 x 6mm white nylon allen screws on each headlight.
There is a cross head screw point at the bottom of each allen key hole.
Note . Up and down affect the same direction, left right does not.