1.
Flick the Start screen to the left, and then in the All apps list, tap [Settings] → [Accounts] → [Sign-in options].
3.
Enter the desired PIN in the [New PIN] input field, and then tap the [Confirm PIN] input field and reenter it. Tap [OK].
4.
In [Require sign-in], tap the drop-down list and choose the time to sign in again.