Simply log in or register at MyCokeRewards and click "Get It" on the offer.
It requires no points at all to qualify and is for new and existing members.
You'll receive a coupon good for your choice of (1) 20 oz. Coca-Cola product
(valid for Coca-Cola®, Diet Coke®, and Coke Zero™).
Limit one per customer. Coupon Expires 5/31/13.