Unfortunately, you cannot change or edit the shipping address or details after a shipment is created. However, you can cancel the order you just made by going to 'Manage Parcel' and clicking on 'All Parcels'. Choose which parcel needs editing, click on the three lines, and click 'Click Parcel'.
You then can go ahead and book a new one by clicking "Rebook Parcel". "Rebook Parcel" enables you to rebook parcel without the needs of going through the booking procedures all over again.
Note: Changes of parcel details will be available in the cart page after you clicked "Rebook Parcel".