If you signed up initially by authenticating a social/linked account, then your account authorization is handled entirely on the end of that provider. This means if you signed up using a Gmail or Amazon account, you would follow their steps for resetting your password.
If you signed up with us directly however, then you can request a password reset link at anytime from our login page.
From the login page, click reset your password here to be taken to a form to enter in the email address for your account. Doing so requests an email with a password reset link. From there, just follow the steps in the email to reset your password.