That card is the only one with a manual Send Emails button. Clicking it immediately sends the Meals To Choose Reminder to every subscriber who still has meals to select for an upcoming delivery, and the page then shows a green banner such as 12 Subscription: Meals To Choose Reminder Emails Sent Successfully. The same reminder normally goes out automatically on a schedule; use the button when you have just published a menu and want customers nudged right away. The email must be set to Yes for the reminder to actually be sent.