Your device can be secured using a pattern that you draw on the lock screen. No one will be able to get into your device without knowing the pattern. If you forget your pattern you will have to reset your device and you will lose any information that is not backed up.
From the Home screen, drag down the Notification Panel.
Tap the Settings icon.
Scroll to Security & location.
Tap Security & location.
Tap Screen lock.
Note: If you'd like to setup Secure start-up, tap YES and follow the on-screen prompts.
Enter your pattern.
Confirm your pattern.
Select a notification preference.
Note: Tap Hide sensitive notification content to prevent the content of emails, texts and other notifications from appearing on the Lock screen. You'll be notified that you have a new message, but not shown what the message contains.