After you create a new account, we send you a welcome email to verify that you own the email address you entered and that the email address works. Find that email (check your spam box if you don't see it) and click the link in it to verify your address and log in to your account for the first time.
You won't be able to log in to your account until your email address has been verified. If you try to log in before verification, you'll receive an error message and we will send another verification email to your email address. Click that new email to verify and get started.