Each email from Repeat will contain an "unsubscribe" link at the bottom or in the footer. Simply click the link, follow the prompts and you will be unsubscribed from that email group.
Please note: There are certain system generated emails that bypass this unsubscribe list, that are triggered by a direct action from you.
An example of this would be "purchase confirmation" email when you buy something from out marketplace. These cannot be opted out of as they are transactional