Use the right dial to scroll through the shots in the Storyboard. When you scroll, a yellow arrow in the Storyboard marks your position. You can then select the shot by pressing the button next to the dial.
You can show the Storyboard all the time or only when you scroll. To show the Storyboard all the time, press Tab on the keyboard. To show the Storyboard only when you scroll, first hide it by pressing Tab, and then scroll the Storyboard. In this mode, you hide the Storyboard again by pressing the button next to the scroll dial.