In order to collect points every time you dine at a participating restaurant you need to register the debit and credit cards. You should register all your cards you are likely to use in a restaurant. If you have not already created a SquareMeal profile simply create one here
https://www.squaremeal.co.uk/account/.
Once you have created your profile, log in and add you card here https://www.squaremeal.co.uk/account/cards/. Remember you get 100 points simply for registering your card.