In order to redeem a Gift Card you need to follow the following steps.
Go to https://socialpottery.com and click on "Book Now" button at the right top corner.
Select you preferred location and click in "Book now" button.
Select a weekday, a session type and click on "Tickets" button.
Find the "Enter promo code" link and insert your Gift Card Code, you can find it at the email or pdf document sent to you and click "Apply"
Finish selectin your time and tickets quantity and finish the checkout, you will be able to see the Gifct Card applied as discount in the checkout page.