Open the bonnet and looking at the top of the headlamp unit, there should be two holes about half an inch diameter just behind the plastic fitting with what look like little cogwheels under them.
One of the holes will adjust the up and down and the other left and right, the inboard one sets the vertical and the outboard one sets the horizontal.
You'll need to use a flat blade screwdriver to move the little wheels.
Before you start adjusting the lights, make sure that the entire unit is properly seated, the whole unit has to be removed just to change a bulb.