You need to follow these steps-
1. Click the start button.
2. Type settings and select settings from menu and click on it.
3. Click on Accounts.
4. Select Sign-in options from left bar and on scroll down on Password and click Change button.
5. Enter your PIN in case your system has PIN.
6. Enter you windows credentials.
7. Now enter your old password and new password and conform password and click Next button.
Conclusion
This blog demonstrates how to change password in windows 10 machine. If you have any questions, post a message in c-sharpcorner comments section.