Nikon D750 DSLR Camera (Body Only) - Manual (Page 208)

180
Flash Photography
The built-in flash can be used not only when natural lighting is
inadequate but to fill in shadows and backlit subjects or to add a
catch light to the subject’s eyes.
Auto Pop-up Modes
In i , k , p , n , o , s , w , and g modes, the built-in flash
automatically pops up and fires as required.
1
Choose a flash mode.
Keeping the M ( Y ) button pressed, rotate the main
command dial until the desired flash mode appears in the
information display.
Using the Built-in Flash
M ( Y ) button Main command
dial
Information display