Hold the d button and rotate the rear command dial until the desired value is displayed in the viewfinder or LCD monitor.
The amount of compensation available varies with the shooting mode.
The d Button
If ON/OFF SWITCH is selected for DBUTTON/DIAL SETTING > EXPO. COMP. BUTTON SETTING, exposure compensation can be set by pressing the d button once, rotating the rear command dial, and then pressing the d button again. Exposure compensation can be assigned to other controls using DBUTTON/DIAL SETTING > FUNCTION (Fn) SETTING.