What exactly you need to do to unlock your QuickBook account largely depends upon the reason for being locked. Simply change the password and unlock your QuickBooks online account. You need to do is click on the forgotten password and recover password. After that, you will have to pass verification. Due to any mysterious reason if you are not able to login to your QuickBook account then it is time to get more technical. You can contact QuickBook representative and fix the QuickBook login error.