Go here and make an account. Then click this link and the code should be applied by default.
If you scroll to the bottom it will say:
Subtotal $22.99
Promo: 100% Monthly Discount x12 -$22.99/mo for 12 months
Total $0.00

You will need a credit card to checkout. After you do all of that go here, click manage plan, and click the cancel subscription button. It will be valid for the next year and you won’t have to remember to cancel next season.