After you create your account you will need to click on the link that's sent to the email address you provided within 72 hours of creating the account.
 
It's possible you didn't receive the email because you had a typo in your email address. Also check if the activation email landed in your spam or junk mail folder, as it might have been placed there by your email provider.
 
 If you didn't click on the link within three days you'll have to sign up again for a new account with a different username.

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