What happens when you click the "Subscribe to my list button:"
1 - your email address (and name info if entered) is added to my my list named Listserv
2 - you are redirected to a landing page (nbcnews.com)
3 - because you are added to my list, you will receive an autoresponder follow-up email
4 - when you open the follow-up email, you can click the unsubscribe link (don't worry, there isn't a real newsletter you'll be receiving)
5 - because you opened the follow-up message, you will receive one more message, which is based on using a trigger (the open event triggers a message)