The adjustment screws are found on the headlight housing, i believe the up and down screw is on top of the housing, while the left to right screw is on the back of the housing and not accessible if the headlight housing is still attached to the car.
THe yellow ball is in the headlight housing its self you need to remove the headlight and the back cover to look inside. Post #43 has the back of the housing off, the ball is attached to that silver round thing farthest to the left
http://www.e90post.com/forums/showpo...9&postcount=43