So you wanna set up a subscription list in Engage that the public can subscribe to? Read on!
Head to your Engage tab (Admin bar > Engage):
Navigate to your Lists tab, then click on the Add a List button:
Give your list a name and then click Add List when done to see your list appear in the Lists tab:
You did it!
This list will now appear under the Join our mailing list tab (visible only to visitors who are not logged in as admin users):