Please note, if you've already used an address within an order, modifying the address book will not modify the address/phone number on the order you've already placed. To modify the address on an order that's already placed, you need to contact our customer service. The fastest way to reach our team is either by online chat or by calling our toll free number 1-866-979-7463 (24H Mon-Fri EST). Our support email firstname.lastname@example.org takes about 1 business day for a reply.
To modify your address book, you would go under Your Account → Address book → Then you may Edit, Remove or Set as default your address and phone number.
You may also add a new address as shown here: