Activation code reset
If you signed up for an account but didn't activate it then you won't be able to log in. Accounts can only activated by following a link in the email that was sent to you when you signed up.
If you have lost the email you can request another activation code by entering the email address you used when you signed up into the form. If you made a mistake in your email address when signing up then you'll need to re-register.
If you've played during the last five seasons then your account should still be active and you can log in.