If you've received a gift subscription to Acorn TV, visit www.acorn.tv/redeem to set up your new Acorn TV account and redeem your gift code. Follow the steps to create your account, and enter your activation code in the "code" field. Once you've set up your account, you'll have 12 months of unlimited access to Acorn TV.
If you're already a member and have received a gift, simply visit https://account.acorn.tv/#applyPromoCode and enter your gift code.