You must login to change your password.
Click on My Account from the Main Menu.
From the left menu click on "Settings"
On the Settings page you will have tabs in the center section, click on the "Change Password" tab.
We don't need your old password and we don't need to ask you to enter it twice. Just be sure you enter it correctly.
If you do make a mistake and changed your password to include a typo simply reset your password and try again.
You will need to sign out and sign in again with your new password.
How to reset your password