Samsung Galaxy A8s User Manual page 171

Settings
3
Place your finger on the fingerprint recognition sensor.
4
After the device detects your finger, rotate your hand and place the same finger on the
fingerprint recognition sensor again.
Repeat this action until the fingerprint is registered. When you are finished registering
your fingerprints, tap DONE.
When a fingerprint lock screen appears, tap TURN ON to use your fingerprint to unlock
the screen.
Deleting registered fingerprints
You can delete registered fingerprints.
On the Settings screen, tap Biometrics and security → Fingerprint Scanner.
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2
Unlock the screen using the preset screen lock method.
3
Tap EDIT.
4
Tick fingerprints to delete and tap REMOVE.
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