Can we change the shipping address for the order we just placed?

We purchased our train tickets to be shipped to our home and realized after purchase there must be someone to sign for the tickets. We would rather have them sent to our work so someone is there to sign or have them sent to the UPS store by our house. Is there a way to change the shipping address? We have requested them to be overnighted as we are leaving in one week. Thanks so much for your help!
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