Hello @Seller_qGeiSgUg0A1X3

Thank you for posting your inquiry to the Forums.

For clarification, is your default return address the same as your business address? In this case, you can update your business address by navigating to Settings > Account Info > Business Information > Business Address. Once your business address is updated, you can set it to be your default return address by navigating to Settings > Return Settings > Manage Return Addresses > pencil icon of the store for which you want to edit the address > select the default return address that you would like to use and click Use this address.

I have included some help pages below that provide additional detail on return addresses for your reference if needed:

Return address settings

Multiple return addresses

Regards,

Quincy_Amazon