Go to Settings > Accounts > select Sign-in Options in the left pane. Windows 10 provides the option to login to computer using a 4 digit PIN, instead of using a regular alpha-numeric password. You will see Password Changed confirmation, once your Microsoft Account Password is changed. Once your Email Account is verified, you will be provided with the option to change Microsoft User Account Password. Enter your Current Password and then type in your New Password.
On the next screen, enter the Security Code and click on the Verify button. On Verify your identity screen, click on your Email Address to receive a Security Code from Microsoft. In the right pane, scroll down and select the Password option and click on the Change button.
