Samsung SM-T820 User Manual page 120

Settings
Deleting fingerprints
You can delete registered fingerprints.
On the Settings screen, tap Biometrics and security → Fingerprint Scanner.
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Unlock the screen using the preset screen lock method.
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Tap EDIT.
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Tick fingerprints to delete and tap REMOVE.
Unlocking the screen with fingerprints
You can unlock the screen with your fingerprint instead of using a pattern, PIN, or password.
On the Settings screen, tap Biometrics and security → Fingerprint Scanner.
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Unlock the screen using the preset screen lock method.
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Tap the Fingerprint unlock switch to activate it.
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On the locked screen, place your finger on the Home key and scan your fingerprint.
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