To modify a recurring or one-time future dated eCheck payment, select “Manage Auto-Pay” from your Dashboard and in the "My Scheduled AutoPays" tab, select the “Edit” button for the AutoPay you wish to modify

Select the information that you wish to update: Frequency, Start Date, End Date and the Payment Day of the Month under Autopay Settings.

To change the payment amount, click the blue button that says, "Continue without modifying payment method" which will bring you to this screen:

Update the payment amount as necessary and click "Submit Payment" to apply the updates.