Read the rules and regulations written on the coupon making sure you check on its validity. Take it to the restaurant cashier and he or she will instruct you on how to redeem it. Check out http://www.ehow.com/how_7562765_redeem-coupons.html for more information.
OK, first you have to got to www.restaurant.com and click on redeem gift. It will ask for your certificate code which if you bought a $50 card for $25, will be on the back of the plastic card sent to you. The web site will also ask you to identify a series of letters to make sure you are you. Then it will ask for your zip code and you will then "buy" a certificate at a local restaurant and when you do, you will see the balance left in your account. I hope this helps. It's a little convoluted getting your certificate but it seems to eventually work. If you have questions, you can call 1-800-979-8985.