Confirm Subscription
Almost there.
To make sure that you were definitely the person who was signing up (and your friends aren't using your email address to sign you up to a bunch of newsletters that you don't want... some friends huh ;) you click the button in the email I would have just sent you to confirm.
If you didn't subscribe then you can just delete that email and ignore it and I won't be sending you anything more (but I hope you have subscribed).