To Change the password to your account, please log in to https://portal.office.com/
Click the icon on the top right corner and click View account
You will see the dashboard that the left side menu, Click password
After that, you can now change your password.
*Note: A strong password provides essential protection from financial fraud and identity theft. One of the most common ways that hackers break into computers is by guessing passwords. Simple and commonly used passwords enable intruders to easily gain access and control of a computing device.