Further to Rowdie's comprehensive instructions here are additional tips.
1. Remove the headlight’s wipers
2. Loosen the two fastening screws (2) of cover plate (1). Lift cover plate (1) inside, push slightly outwards and remove.
3. Loosen all three fastening screws (5). Push light unit slightly downwards and swivel in outward direction.
Note: To swivel headlamp unit, the bumper may require loosening in some models and pushing slightly downwards.
Pull off electric plug connection at the rear.
3 Adjusting screw for lateral adjustment
4 Adjusting screw for height adjustment
5 Fastening screws for headlamp unit