To change your default shipping or billing address, please first log in to your account.
Go to your Account Settings, and select the tab Address Book. Toggle between the "Shipping" and "Billing" tabs, and click on "Make Default" on the address you'd like to change.
In addition to default address, you can also add and save new shipping or billing addresses. You can change or delete the additional shipping or billing addresses by clicking on the "Edit" or "Delete" button next to the address.
The change on the shipping or billing address will not affect pre-orders/ orders that you have already placed.