You use a headlight adjustment tool on a flat level surface, if it has built in levelers. Or an aiming device if it does not.
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you can adjust you headlights by backing out a small screw or screwing it in, directly next to the headlight assembly..under the hood. pretty sure
You can adjust the headlights on a Saab 9.3 using the switches inside of the car. There should be a function to turn the highlights on, off and bright.
If you respect others then you will go to an auto body shop and have them adjust them for you. I am sure you have had the experience of someone elses misadjusted headlights.
See www.aclassinfo.co.uk