You will first of all be requires to sign up and confirm your mail to get a chance. You will then be required to earn points by playing the game, complete the offers and take surveys. Once you have your points you can redeem your points by going to the Spend Points Tab, then Find Prize. Search for the "PlayStation Card" to get your Free PSN Card and then add it to cart. Use your points to purchase and then wait for your Free PSN Card.