You can change your address registered at the Official Shop even after you have purchased the product.
After logging in, please go to My Page > Account Settings and change your address.
https://party.shingeki.tv/user/account
However, after March 1, 2024 (JST), you will not be able to change your address, as the products will be prepared for shipping.
Multiple addresses cannot be registered for various purchases; only one can be registered per account.