i know that its just an app, and it cant actually scan your fingerprint. but it says the trick to making it look like its scanning ur fingerprint is to tap the hidden Lock and Unlock button at the top of the screen, but even though i click it and "scan" my finger, it says "fingerprint does not match". i click where the Lock and Unlock buttons are suppose to be, but it doesnt work! do u have to do it in a certain order? help! 