An e-mail will be sent to the address you specify in order to verify the account. The account will then remain linked to that e-mail address for such purposes as password resets. The e-mail address linked to an account can be changed later.
For security-conscious users, there is technical documentation available about how the site manages passwords.
To protect your password from being overheard while in transit over the Internet, you may want to use our SSL protected site.