Lee & Maria's gift certificates are printed or emailed sheets of paper that include a promo code.
I am a member: To use the promo code, go to the Redeem Gift Certificates page in account settings and enter the promo code. The specified dollar value will then be added to your account and used for your next delivery.
I am NOT a member: You will first need to create an account with Lee & Maria's, choose a box size, schedule (or one-time delivery), and payment info. Once your account is set up, head to the Redeem Gift Certificates page and enter your promo code.