To redeem a promo code, click on this link- Redeem Promo Code
Enter the email address of the Caribu Account you would like to add the Promo to
Then enter the promo code you received.
Once it's entered, your subscription will show up across devices, just make sure you're using the same email address for all devices.
If you don't have a Caribu account yet, you'll need to sign up first.