1. To setup Fingerprint Lock in your SAMSUNG Galaxy J7 Prime go to Settings, you can find Settings icon by dragging down top bar in the right corner.
2. Next tap on Security settings.
3. If you have Pin/Pattern lock screen setup you can now skip to step 5, if not go to Screen lock type.
4. Now setup PIN/Password.
5. When your Lock Pin is setuped go to Fingerprints in Security Menu.
6. Enter your PIN.
7. Now you can Add New Fingerprint.
8. Now follow instruction on screen to setup your Fingerprint properly.
9. Congratulation You just Add New Fingerprint Lockto your SAMSUNG Galaxy J7 Prime .