Nikon D3100 User Manual page 101

Set exposure
compensation
(mode P, S, or A;
0 81).
Mode P, S, or A
Choose a flash mode (0 68).
Adjust flash compensation (mode P, S, A, or M; 0 83).
P, S, A, or M
The role of the Fn button can be selected using the
Buttons > Fn button option in the setup menu
(0 146), allowing the following settings to be
adjusted by pressing the Fn button and rotating the
command dial:
Image quality/size (0 64)
White balance (0 87)
E button
M button
+
M button E button
+
Command dial
+
Command dial
+
Command dial
Fn button
ISO sensitivity (0 71)
Active D-Lighting (0 85)
Information display
Information display
Information display
+
Command dial
X
9