Nikon D3300 Reference Manual page 148

2
Fine-tune white balance.
Use the multi selector to fine-tune white balance.
A
White Balance Fine-Tuning
The colors on the fine-tuning axes are relative, not absolute. For
example, moving the cursor to B (blue) when a "warm" setting such
as J (incandescent) is selected will make photographs slightly
"colder" but will not actually make them blue.
3
Save changes and exit.
Press J.
128 P, S, A, and M Modes
Increase green
Increase
blue
Increase magenta
Increase
amber
Coordinates
Adjustment