These are one-time payments that draw from a payment method that you've set up in My Account. In most cases, you get to choose the payment date, amount and payment method. Scheduled payments must be made before your due date, and if an account is past due, the current date is required.
You can change or delete most scheduled payments in the Manage Scheduled Payments section of My Account. Keep in mind that if a debit or credit card transaction is pending, you won't be able to change or delete the payment.