Samsung SM-J415F/DS User Manual page 140

Settings
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Place your finger on the Power key.
After the device detects your finger, lift it up and place it on the Power key again.
Repeat this action until the fingerprint is registered.
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When you are finished registering your fingerprints, tap Done.
Deleting registered fingerprints
You can delete registered fingerprints.
On the Settings screen, tap Biometrics and security → Fingerprints.
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Unlock the screen using the preset screen lock method.
Select a fingerprint to delete and tap Remove → Remove.
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