Adding or updating your business address is possible through the BugSplat payment portal.
To do so, navigate to the Company page and click on the link that says 'Manage your plan.'
Next, click the link that says 'Update Information' under the title Billing information. There you can enter your billing address. Your billing information will include it on your next invoice.
This is particularly useful for adding a business address to invoices for VAT purposes.
If you have any questions or want further confirmation, please email sales.