Free Customized 5x7 Mother's Day Card 1. Go to Hallmark.com you must create an account , enter your email address and select a password 2. Choose and customize a card. 3. Register & checkout. Enter promo code CARD4MOM . 4. You're done! Note , it does not seem to work if you choose for them to mail it for you and add a postage stamp. I told them to send the card to me and I would send it , as the option. Then I entered mum's name / address instead of my own. You do not have to select a mum's day card , you can use the promo code for another type of personalized card that you design and save to be delivered within one year.