First there are measurements you need to make.
Go online and find out what didtance and height your lights are allowed to be in your state. (Is should be the same for all states)
Then park you car on level ground facing a flat wall. With masking tape, use your measurments to place the tape on the wall in the locations indicated by the measurments.
If you have any thing heavy in the car upsetting the normal balance of the car, you might want to remove it, (like a trunkful of something)
Open the hood of the car (engine does NOT have to be running.
Around the headlamp assembly, you will see several screws, one on top and several on the side or front. These will allow you to adjust the direction of the headlight beam.
Start with the low beam, and use the screws to move the light spot on the wall to the tape you placed earlier. The tape should form a "T" The top of the light spot should be flat, so place that at the top of the "T". Then center the mass of the light spot on the vertical piece of tape.
Perform this action for the other headlamp.
Switch to the high beams and insure you do not exceed the measurements.