Add/Delete an Address
Go to Settings. From there you can change your "Primary Ship To Address" and your "Primary Ship From Address". Tap on whichever you would like you would like to change, then tap "Add a new card". Enter your new address information then tap "Save".
The "Primary Ship To Address" is the address you would like your purchases to be delivered to.
The "Primary Ship From Address" is the address you will be sending the item you sold out from, or the address you would like to appear on the shipping label. In the case where an item must be returned to you, this address will be the one used.
To delete an address, simply tap on the pen and paper icon next to the address, then tap on the trash can icon on the following page.