On the rear of the bulb housing (so the side facing you when sat on the bike) there's 2 screws at the bottom and in between the two rubber protectors, they adjust the vertical (left adjusts the left bulb right adjusts the right bulb) clockwise to lower the beam and anti clockwise to raise it.
Remember these can be used if you find yourself stuck out at night and dipped beam goes, use high beam and adjust it lower to get you home!
Diagonally opposite each rubber protector is the horizontal adjuster for each bulb.