you need to redirect them to the origional register.tpl.
One thing that you can do is make a copy of the register.tpl and make it look more like a shipping address page. (comment out all the other stuff)
If you just add the shipping fields to the final stage of the order page you may end up getting in correct shipping charges.
When the customer is on the final stage of ordering (where the ship to name is) the details get sent to the orders table. At other stages of the store the shipping details are worked out from the details in the customer table
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