You have the option to require users to Sign In to your site before they can Sign Up for a Notify Me List. This adds security to your site.
If you require Sign In, users will see a Sign In button when they try to sign up for the Notify Me List. You can also choose to have different header text for when the Sign In button appears and when the user is logged in.
To turn on required Sign In or to configure header text, contact Support.