To contact you . FSD may periodically send promotional materials (e.g., newsletters) or notifications related to the FSD Services to the email address you provided to us at registration or for your account. If you want to stop receiving promotional materials from an FSD Service, you can change your FSD account setting, or follow the unsubscribe instructions at the bottom of each email, or send an email to the applicable FSD Service email contact for ""Privacy Policy matters"" listed here. There are certain service notification emails that you may not opt-out of, such as notifications of changes to the FSD Services or policies. If you have installed a mobile app and you wish to stop receiving push notifications, you can change the settings either on your mobile device or through the app. 