From the Settings app, scroll to and tap Security & privacy.
Tap Device unlock.
Tap Fingerprint & Face Unlock.
If you have a Screen lock set, you will be prompted to input your pin, password, or other screen lock info.
Tap Face Unlock.
If you do not have a Screen lock set, you will be asked to add a backup screen lock method.
Tap I agree.
Tap Start.
Follow the on-screen prompts to capture your face.
Tap Done.
You've completed the steps!
