Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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More on Photography
Manual Focus
Manual focus can be used when autofocus is not available or 
does not produce the desired results (
1
Select manual focus.
If the lens is equipped with an A-M, M/A-M, or A/M-M mode 
switch, slide the switch to M.
If the lens is not equipped with a focus-mode switch, select 
MF
 (manual focus) for Focus mode (
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
A
AF-P Lenses
When an AF-P lens (
0 252) is used in manual focus mode, the in-focus 
indicator (
I) will flash in the viewfinder (or in live view, the focus point 
will flash in the monitor) to warn that continuing to rotate the focus 
ring in the current direction will not bring the subject into focus.