Check if your address is currently eligible to register on Delivery by Amazon in the program's settings page. More pickup and delivery destinations will be added to the Delivery By Amazon program on an ongoing basis, and this page will be updated with the new additions.
If you are enrolled in the Delivery By Amazon program, each order that needs to be delivered using Delivery By Amazon will have a Schedule Pickup button on the Manage Orders page instead of the Confirm Shipment button.