This is how to change the sign-in password or the Windows Hello PIN on a Windows device.
Change your password
Press Ctrl + Alt + Del.
Choose Change a password.
Enter your old password and your new password twice.
Press Enter to confirm.
Change your PIN
Open Start › Settings › Accounts › Sign-in options.
Choose PIN (Windows Hello) › Change PIN.
Enter your old PIN and your new PIN twice, then confirm.
Tip: On company devices, make sure you are connected to the company network (on site or via VPN) when changing your password, so the new password applies everywhere right away.
Note: If the new password is rejected, it is too short, too simple or was used before. Support resets forgotten passwords.