Most smart phones allow you to set up easy log in methods such as face ID or touch [fingerprint] ID.
You will need to navigate to your phone's settings and locate the security or biometrics menu. From this menu, set your preferences to face ID or biometrics ID.
To enable this for your Sibstar app, make sure you log into the app using your regular password or passcode.
Within the Sibstar 'Settings' you will see the option to 'Set up your face or touch ID'. Switch the toggle to on, and it will turn green.