Just ask the Cashier. They activate it on the spot. You can join Martins on line. I used my rewards for gas. I saved 30 cents a gallon. The second time was 10 cents. You do have to shop to increase points. Can't find your card? Enter your phone #.
Go inside to the Customer Service desk. Ask for the manager on duty and see about how they want you to apply. Best of luck
Thanks! Your answer is awaiting moderation.