Now that the iPhone 5s has a built-in fingerprint sensor, users can easily secure their devices without the everyday use of a manually entered passcode. Before the Touch ID system can be used, you must set up the system with your fingerprint. To setup Touch ID on the iPhone 5s:
1. Navigate to Settings -> General -> Passcode & Fingerprint2. Select Turn Passcode On and enter a four-digit passcode twice3. Select Fingerprints -> Add a fingerprint...4. Place the finger you wish to use for unlocking iOS onto the home button5. When the iPhone vibrates, lift your finger6. Repeat steps 5-6 multiple times, until the grey fingerprint turns completely red7. When complete, you will be prompted to adjust your grip8. Repeat steps 5-6 repeatedly, this time focusing on the sides of your fingerprint9. After enough data is collected you will see the "Success" message10. Touch Continue11. Passcode Unlock will be enabled (green) on the Fingerprints screen12. Switch iTunes & App Store ON (green) to use Touch ID with these services
Additional fingerprints can be added to the Touch ID system by repeating the process above.
Note you will be prompted to enter your passcode in the following situations:
To make changes to Passcode & Fingerprint settingsAfter a restart of your iPhoneAfter 48 hours or more has gone by without unlocking your iPhone