Nikon D500 - Manual (Page 169)

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Exposure compensation is used to alter exposure from the value
suggested by the camera, making pictures brighter or darker. It
is most effective when used with center-weighted or spot
metering (
0 128). Choose from values between –5 EV
(underexposure) and +5 EV (overexposure) in increments of
1 /
3
EV. In general, positive values make the subject brighter while
negative values make it darker.
To choose a value for exposure compensation, press the
E button and rotate the main command dial until the desired
value is displayed in the viewfinder or control panel.
Exposure Compensation
–1 EV No exposure
compensation
+1 EV
E button
Main command dial Control panel