The promo code field is made available during initial registration of your Viggle account. You have 30 days to enter the promo code if you don't have it or missed it during the registration process. To add the promo code, go to your Profile > Settings > TV Provider. You will see under the DIRECTV listing whether or not the promo code has been applied. Tap on DIRECTV to enter your promo code. The promo code can be found in all of DIRECTV's promotional materials.