Lenovo A10-70 Tablet - Manual (Page 5)

Screen Lock Pattern Setting
You can set the screen lock pattern by tapping Settings > PERSONAL
> Security > Screen lock > Pattern. After this function has been enabled,
you will be required to trace a personalized unlock pattern to unlock the
screen before you can use your tablet.
1-6 Navigation Tips
Back : Return to the previous screen.
Home : Return to the Home screen.
Recent Apps : Display recently used apps.
Advanced Menu : Display shortcuts such as System Settings,
Preferences, Preview, Wallpaper, Theme, and Add Widget.