Samsung SM-J610FN/DS User Manual page 130

Settings
Registering fingerprints
On the Settings screen, tap Biometrics and security → Fingerprints.
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Read the on-screen instructions and tap Continue.
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Set a screen lock method.
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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.
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