If you would like to configure an automated response to new subscribers, you will need to enable the Auto-Responder.
To do this, click on “Auto Responder” under “Campaigns” on the left side bar.
You must now choose the “Title” and “Message” for your response and then hit “Update”.
To enable it, simply hit “Enable” at the top of the page.
Once enabled, the web page should look something like this: