DROID MINI / DROID ULTRA / DROID MAXX by MOTOROLA - Set Up Screen Lock
If using Microsoft Exchange / Corporate sync, some Screen lock options (e.g., face unlock, pattern, PIN) may be unavailable.
These steps can also be utilized to change your current screen lock setting.
From a Home screen, tap Apps (located at the bottom).
From the Apps tab, tap Settings.
Tap Security & Screen lock.
Tap Screen lock.
If presented with "This device does not have a Google account associated with it. If you forget your PIN, it cannot be sent to you and a factory reset will have to be performed to recover the device.", tap Add Google account now to setup an account before proceeding. To proceed without setting up a Google account, tap Continue.
If presented, enter the current PIN/password/pattern.