On my car, there are two white adjusters on the top of the headlight unit - one adjusts up/down, the other right/left. With the hood up, look at the top of the light unit - the adjusters are mounted vertically, so the heads are on top of the housing, but under the edge of the body just behind the clear lens. Each is about 25% of the way in from each end.
These adjusters move the housing, which aims the high beam and the foglight.
If you have HID low beams, they are automatically adjusted up/down each time that the car is started.
If you have standard halogen lights, moving the adjusters adjusts all of the lights in the housings.