How do I change my email address or password?
Both are in your Account settings.
Password
Open Change password, enter your current password and the new one, and save.
Open Change email and enter the new address. For security, changing your email may require you to confirm the new address before it takes effect, so keep an eye on that inbox.
Tip: If you ever can't sign in, use the Forgot password link on the login page to reset it by email.