Press the i button to display the i menu.

Highlight items using the multi selector and press J to view options, then highlight an option and press J to select it and return to the i menu (to exit to the previous display without changing settings, press the i button).

The Command Dials

You can also adjust settings for highlighted items by rotating the main command dial to choose an option and then pressing J (sub-options, if available, can be selected by rotating the sub-command dial; in some cases, the same options can be selected using either dial). The current option will also be selected if you highlight another item with the multi selector or press the shutter-release button halfway.