7 day trial and use of redemption codes

I am currently half way through a 7 day trial of CC Photography plan and have a redemption code following the registration of a new Segate SSD that should provide me with the first 2 months free of any subscription charge. (The redemption code had not been provided in time for my sign up to Adobe CC).

Any help on how i should use this redemption code would be appreciated.

PS i am in the UK if this makes any diffrence.