The invoices for your Teamwork Projects subscription will use the address details for the owner company of the site.
To update these, go to the 'People' tab at the top of the screen and on the left, choose the 'Companies' section.
The owner company is identified by a tag, and if you click to view the company details, you'll see an edit icon on the right:
Clicking this allows you to update the name and address of your company which is shown on the invoices.
Note - tax number and other payment details need to be updated through the 'Subscription' area of the site settings.