Zoom H4n Pro Operation Manual page 24

The DIAL and the MENU button are used for various settings while recording and during playback.
Here are explanations about their basic operations.
MENU button
023
DIAL
Press
Rotate the DIAL, and the cursor on the display will move with the DIAL
When there are additional selections, press to move to the next screen.
When you complete selection, the screen returns to the previous one.
Press the MENU button to make settings for recording, playback and other functions.
Press the MENU button during any setting operation, to cancel the operation and return
to the previous screen.
To cancel a setting operation and return to the top screen of the mode, press the MENU
button for more than 2 seconds.