When the environment has more light than is needed, reduce the exposure setting (by using the negative - count) to reduce the amount of light allowed into the lens by your camera.
If the environment has less light (darker) than is needed, increase the exposure setting (by using the positive + count) to increase the amount of light allowed into the lens by your camera
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1)Press the UP or DOWN direction control buttons to scroll through the menu options.
2)Press the OK button to select the desired option.
3)A 
selected option icon will appear on the selected item
4)Press the MODE button to exit the menu and return to your previous mode.
5)An icon reflecting your selection will display on the LCD screen
6)Remember that this setting will be remembered by your camera until you manually change the setting or restore the camera‟s default factory settings.
ISO Menu 
The ISO menu allows you to set the level of sensitivity that your camera has to light in the surrounding environment. When the ISO level is increased, the image sensor in your camera will be more sensitive to light
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