You can set up or change the password anytime. If you forgot the password, just remove the password and re-enter the updated one. Just make sure you log in as the Administrator in the company file.
Here's how:
Click Edit on the top menu.
Choose Preferences.
Select Accounting and tick Company Preferences.
At the bottom of the screen, tap the Set Date/Password button.
Select the Closing Date.
Create the new password in the Closing Date Password field.
Enter the password again in the Confirm Password field.
Press OK.
Once done, close and re-open QuickBooks to save the changes.
