Bi-xenons are self-levelling and don't have the little adjustment wheel like halogens do.
To the OP, you can either do it yourself (roughly as outlined below) or take it to a dealer. Get them to do it for free because it should have been correctly set during PDI.
The little white screws are what you need to adjust. the inner one is up-down and the one between the front guard and light is left-right...
My suggestions is:
1. Park on a flat surface infront of a wall.
2. Adjust beam up or down until the beam cutoff on the wall is level with the lamp. Mark position of beam cutoff.
3. Move car back a couple of meters.
4. If the beam cutoff moves, adjust as required.
5. Keep moving the car back and forward until the beam cutoff stays at a constant level.
You'll end up with low beam that throws light as far as possible without it being aimed too high at distance and blinding other drivers (and them flashing you in return). High beam should be like daylight.. :biggrin: