I am gus who asked the question, and it was the user's manual instruction with which I had some difficulty to understand the function. In the meanwhile, I have figured it out, there are two ways to get the focus fine tuned: as indicated, in the P,S,A,M.U, sports and special effects scene mode; press the multi selector cursor down and select Manual Focus.
Use the multi selector to adjust the focus until you are satisfied.
Press the OK button. The focus adjustment you have just made is now locked in.
Now press the shutter release button to take your picture.
The second method uses "AutoFocus" to make the fine adjustment as follows;
As before press the multiselector down and select Manual Focus
Now, press the multiselector to the right
This will get you a screen that you have to confirm if you want the camera to use Auto Focus to do the fine focus adjustment. Select Yes and press the OK button and hold it in until the camera made the focus adjustment, you'll see the camera hunting for a focus spot in the center of the focus area.
Now you can push the shutter release button and take your photo.
And there you have it.
Apr 26, 2013 by
Bremerton, WA, USA
Age: Over 65
Favorite Subject: Travel
Nikon Family: 6-10 years
Experience: Less than a month
Role: Serious passion, hobbyist