You need to click the button at 6 o'clock until the moon is growing at 5% to coincide with Dec 7 2010. You will have to eyeball this by clicking until the moon just starts to appear. The last full moon was November 21 and the next one is Dec 21. It is easier to adjust the moonphase when the moon is full rather than estimate the 5% that it is now. Whne the moon is full, you should see the entire moon in the middle of the aperture.
Also, your leap year indicator is not correctly set. It should be on the "2" marking. You have to set the month forward by clicking the button until you get to the next December (24 clicks in your case) where the leap year indicator is pointing at "2."