There are two plastic Phillips-head adjustment screws. The outermost (thru a hole in the front reinforcement) takes care of the horizontal, side-to-side adjustment. The innermost (closest to the radiator, usually hidden by the cable harness) takes care of the vertical, up-and-down adjustment. Here's a pic from my passenger-side headlamp, but mind you that I have facelifted bi-xenon ALS headlamps; yours will be different but the screw arrangement should be the same.
Here's a very good article on proper headlamp aiming:
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