In order to enable the biometric unlock option for your NordPass vault on Android, follow these steps:
1. Go to the NordPass Settings. Find the feature 'Unlock with Biometrics' and click on the slider button.
2. Then, you will be prompted to type in your Master Password to proceed.
3. After entering the Master Password, confirm the biometric unlock with your fingerprint.
And that's it! Next time, to unlock your NordPass vault, you can just use your fingerprint.