You have already established the auto payment ACH connection when you connect your bank account on Happy Mango during the loan application. Your payment is made automatically on each payment due date according to the loan payment schedule. There is nothing else you need to do.
You will receive an invoice email and text a few days before the due date and a separate confirmation in email and text as soon as the payment has been made or failed. You can see the account linked to making the ACH payments on the loan by selecting "Loans" from the top right drop-down menu.
Please visit this Happy Mango article to learn more about other payment methods.