Go to archeron. Say to whoever is behind the counter that you want to register to the magic the gathering website so that you can recieve your free deck. Theres a computer instore that you can use to do this. You will a valid email address and be able to sign in to your email inbox to show the confirmation email. But since you have a promotional code.....walk in and hand it to whoever is behind the counter.
Growing Old Is Inevitable, Growing Up Is Optional.