Your billing address will be automatically imported from your eBay account and therefore the billing address on your eBay delivery invoices will be taken from eBay.
If you wish to modify the information displayed on invoices you can do so by visiting the section "Settings" that can be found within the "buy labels in bulk" function of your ebay delivery account:
Click on this link to go directly to the page.
From there move to "My invoicing address" and add your billing address as needed. You can specify whether you have a business or private account. Finally click on save.
Please remember that any changes made to your billing details will only be reflected on future invoices as it is not possible to amend previously created invoices.