If you want to send an Email of the reminder to the customer of their incomplete purchase process, click on the ‘send’ icon, the customer will get an Email of the incomplete purchase.
On getting the mail, the customer who forgot the complete the checkout process, can continue with the checkout process and make payment of their incomplete order from the email’s details.
If you have sent the reminder through email, you will get the “Email Status” as Sent with the counter of sent emails.