Nikon D3300 - Manual (Page 111)

91 More on Photography
Manual Pop-up Modes
In P, S, A, M modes, the flash must be raised manually. The flash
will not fire if it is not raised.
1
Raise the flash.
Press the
M (Y) button to raise the
flash.
2
Choose a flash mode.
Keeping the
M (Y) button pressed, rotate the command dial
until the desired flash mode appears in the information
display.
3
Take pictures.
The flash will fire whenever a picture is taken.
+
M (Y) button Command dial Information display
M (Y) button