Keep your Microsoft account more secure by changing your password regularly. It only takes a few steps.
Follow these steps to how to change Microsoft Account Password:
Sign in to your Microsoft Official Account using your current password. If you forget your password either choose Forgot my password and follow the steps. Or, for account sign-in issues, see How to Reset Your Microsoft Account Password.
Once you are signed in, choose Security
Choose Password security
Then, type your current password, then type a new password and type it again to verify
And, Click to Save.
Still, you have any problems related to Change Your Microsoft Account Password. So, you can connect with Microsoft help desk.