Enabling Touch ID will allow you to unlock your Hart app using your fingerprint with the built-in fingerprint scanner on your phone or device. Enabling Passcode will allow you to unlock your Hart app with a 4-digit passcode.
1) From the "Me" home screen select the gear icon in the upper right hand corner.
2) Select "My Account"
3) Under security you can toggle on the option for Touch ID and/or Passcode
Note: In order to allow a Touch ID, you will be prompted to first put in a Passcode