Your billing address will be automatically imported from your PayPal account and, therefore, the billing address on your PayPal Delivery invoices will be taken from PayPal.
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 PayPal delivery account.
By clicking on settings>billing>invoicing, you can access "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