To update your password, click on the Profile button in the top right-hand corner and the select Profile.  There will then be the option to change your password. 

If you started your account using Google Sign-in and never created a password, you will need to use the "Forgot your password?" button that is visible on the login page. You will receive a temporary password that you can use to sign in, and then you can create a password using the method described above.

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