Manual Lock
If your IdeaPad Tablet A1-07 is powered on and you do not use it temporarily, you can tap the "Power" button on its upper right to dim the screen display down. The device will then enter the standby mode and become locked.
How to Unlock
Once in the standby mode, tap the "Power" button on the upper right of IdeaPad Tablet A1-07 to brighten the screen display back up to normal level. You can also touch and slide the lock icon to the right, following the on-screen instructions to unlock the screen, as shown in the figure below: