Refback Bank is a site where you join sites and then RefbackBank pays in return for signing up under them. Hence the term refback. It is quite simple, you just go to their site list and find a site that is being offered for refback, join by clicking on refback's banner, and then confirm that you signed up by clicking the green plus sign once you are done registering. When you reach your minimum, you can cashout. Visit this: http://refbackbank.com/