Frequently Asked Questions - Field Agent Fingerprint App

 Triple tap on the white space below the scan square. The settings screen access was made this obscure on purpose, so you won't reach it by accident when showing the app to friends.

No it doesn't. FAFA is a pure "for fun" application. When you "scan" your finger, a random image is produced. The iPhone's touch screen is incapable of really scanning a fingerprint.