This is a loyalty program that is free to join. They will send you a membership email with with a temporary number. Take in the email and show it to your server to receive your card and your $4 reward. The more times you dine with them the greater your reward. If you dine with them 5 times you get 5% off your next visit. The amount off gets larger the more times you dine with them. They will also send you special offers via email throughout the year.
You can click here to read more about it.