I recently set up the FedEx shipping module on one of my sites.
The problem is that when a user proceeds to checkout without entering their zipcode on the cart page in the calculate shipping page it does not show the shipping options on the checkout page at all. Then when they click "Place order" it spits an error back at them saying invalid shipping option.
I would like to add a button to the Checkout page that says calculate shipping but I do not know what needs to be done to do this. I would appreciate any assistance that can be provided with this!