To get access to all the Microsoft products you need a Microsoft account. If you forgot that account or you think your account is compromised you need to reset your password. Here are the details steps on how to change Microsoft password. Full article here
1. Open Google Chrome or Microsoft Edge or any other browser
2. Now type account.live.com/password/reset in the URL section
3. Enter your email address whose password you want to change
4. Select the recovery email you have given while signing up to the Microsoft account
5. Click Get Code
6. Now you will get a code on recovery mail id
7. Copy the code and paste here and click next
8. Now choose a new password, we recommend you to choose a strong password with a combination of all letters.
9. Confirm your password and click next.
10. See you can not use your old password so choose a new one which you haven't used before.
11. When you enter a new password and click next your password will be changed.