The system has been setup with default values:
DHL, Fedex, Post, UPS
I would like to change these values, but I cannot find the screen to update them and I was unable to update using export/import.
Within QuickBooks you should be able to add/edit/delete the fields: go to the Lists menu, choose Customer & Vendor Profile Lists, and then click Ship Via List.
Let me know if that works for you.