Nikon D3300 - Manual (Page 103)

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Manual Focus
Manual focus can be used when autofocus is not available or
does not produce the desired results (
0 76).
1
Set the lens focus-mode switch.
If the lens is equipped with an A-M, M/A-M, or A/M-M mode
switch, slide the switch to M.
2
Focus.
To focus manually, adjust the lens
focus ring until the image displayed
on the clear matte field in the
viewfinder is in focus. Photographs
can be taken at any time, even when
the image is not in focus.
A-M mode switch M/A-M mode switch