NGM Pico Quick Manual page 30

Customize the unlock screen
Under Settings > Theme settings you can set the background to
display on your unlock screen, choosing between the backgrounds
provided by the system or the pictures in the Gallery.
Main Menu
From the main page scroll from right to left to browse through all
4 menu pages, and from left to right to go back. Press the back
key to return to the previous screen and press the Home key to
return to the main screen.
30 ENGLISH