The dial lets you interact with the display by rotating the wheel left or right or by pressing the button. If your dial isn't connected, which happens when it goes to sleep, you can tap the button or rotate the dial to wake it up and reconnect.
Use the dial to open the quick menu by pressing the button. You can access options for map or dash mode, the main menu, or open up glances. You can also scroll through menu options or move the cursor in glances with the dial.