Simply redeem your points for credit on any future purchase with greetabl.com. You'll have to have at least 500 points to redeem, but that shouldn't be a problem since you can refer an unlimited number of friends and earn 500 points for each one when they make their first purchase!
To redeem your points, click on the "Earn Points" button on the lower left-hand of the page, then click "See rewards you can earn." The rewards options will pop open and you can select any reward you have enough points for!
For more info go to greetabl.com/loyalty