Nice to see you here in the Community. I'm here to provide some insight on how to change your password.
Just to clarify, are trying to change your QuickBooks company file or the Online Account password? If it's for the company file, the steps below will guide you on how to change it:
However, if it's for your Online Account, then you'll need to reset your password in the Customer Account Management Portal Site (CAMPS). For additional insight about these processes, I'm also including this article: Reset your password for QuickBooks Desktop
That should do it. With these resources, I'm confident that you'll be able to change your password in no time!
Let me know if you need further assistance. I've got your back and am always willing to lend you a helping hand. Have a good one.