If you have purchased a Legacy or Starter Pack, please see this thread for instructions on how to claim your items in-game. (Please see the yellow text in the linked thread for instructions on creating a Reman.) (Not seeing your pack in-game? Please see the lime-green text in the linked thread above for information.)
If you have additional questions about the Legacy or Starter pack, please read this FAQ.
Thanks SO MUCH for all your support, and we'll see you in-game!
(However, I don't believe the 30 days sub is now supported for existing accounts, only for new accounts... Cryptic changed their policy when the cost of the package dropped below the cost of the monthly sub...)
You just add it to your current account. All the bonuses will then be added to that account. The 30 days will be added to your sub time, like all keys added to an account do (except for unique keys, only one each of those).