There should be two screws/bolts that look the same but are in different places. One is for up/down adjustment, the other is side/side adjustment. I don't know the specifics on a 6G, as I have a 5G.
Then go to google.com and do a search for "How to aim headlights." It'll list a lot of sites regarding beam patterns and such...
Or go to Borders or Barnes and look at the Chiltons...