When you register a new email address, it does not become immediately active for security reasons. In order to activate it, you have to click on the link that will be contained in a separate email that has the subject line, "Please confirm your email address". A separate request is sent for **each** unconfirmed email address and is only sent to the unconfirmed email address itself.
If you cannot find an email, you can have it resent to you simply by updating your account profile.