Samsung Galaxy Note 4 - Manual (Page 74)

Personalizing
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4
Tap and hold the screen in the fingerprint recognition area, and then drag your finger
downwards over the Home key.
Repeat this action using the same finger until the fingerprint is registered.
5
Tap Done to finish scanning your fingerprint. Or, tap Register to register an additional
fingerprint.
6
When a screen appears requesting to register a backup password, enter the backup
password, and then tap Continue.
7
Enter the backup password again to verify it, and then tap OK.
You can use the backup password instead of scanning your fingerprints.
8
When a fingerprint lock pop-up window appears, tap OK. You can use your fingerprints to
unlock the screen.