What is the Jog Dial? How Do you use it?

Actually that is not what the jog dial does.

4 Doing more with your camera
PASM modes

Settings you change in P, A, S, or M modes apply only to pictures taken in those modes.

For example, if you change the Color Mode to Sepia while in P, A, S, or M mode, you still retain the default setting of Color for Auto and SCN modes.
NOTE: The settings, including Flash, are maintained for P, A, S, and M modes—even when you change modes or turn off the camera. Use Reset Camera (see table on Customizing your camera) to reset P, A, S, or M to its default setting.

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Aperture—also known as f-stop or f-number, controls the size of the lens opening, which determines the depth of field. Smaller f-numbers, for example f/2.8, refer to a bigger lens opening. Larger f-numbers, for example f/8, refer to a smaller lens opening. Larger f-numbers keep the main subject sharp; good for landscapes and well-lit conditions. Smaller f-numbers are good for portraits and low-light conditions. The highest and lowest aperture numbers may be affected by optical zoom.

Shutter Speed—controls how long the shutter stays open. A shaking hand icon warns of slow shutter speeds. (Use a tripod for slow shutter speeds.)

Exposure Compensation—lets you manually adjust the exposure ( 2.0 in 1/3 steps); good for controlling backlit or non-standard scenes. If the picture is too light, decrease the setting; if it's too dark, increase the setting.

Flash Compensation—controls the flash brightness (1.0 in 1/2 steps). You must be within flash range. Unavailable if flash setting is Off.

ISO—controls sensitivity of the camera sensor (80, 100, 200, 400, 800). Higher settings are more sensitive to light, but may produce unwanted "noise" in a picture. You can only use ISO 800 if you are in the 1.1 MP Picture Size setting.

Changing PASM mode settings

The PASM modes control the aperture (f-number), shutter speed, exposure and flash compensations, and ISO. Use the Menu button to control all other settings.

1.

Turn the Mode dial to P, A, S, or M.
The mode settings are displayed.

NOTE: The settings for each mode may be different.

2.

Use the Jog dial:
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Rotate to move between the available settings.
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Press to open a setting.
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Rotate to change the setting.
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Press to save the setting.
3.

Press the Menu button to change other settings.
4.

Take a picture.