When you have successfully signed up, you'll be able to send follow-ups directly from within your Gmail inbox

To send a Follow-up

  1. Go to your Gmail inbox. This can be found at mail.google.com 
  2. Compose a new email as normal. 
  3. In the bottom right of your Compose box, you'll see Select Follow-up. This will allow you to select a Follow-up sequence to send.