How do you adjust the headlights?

My husband has a 2003 Hummer 2. He needs to know how to adjust the headlights. We are getting people flashing us with their high beams because our headlights are too high.

Thanks Sue

You can only adjust up and down. There is a small hole on the bottom corner of the black around the headlight. Use a hex key wrench (forget what size). I was told that side to side adjustment can be done if you are willing to rip some stuff apart.