Within Teamwork Projects, the invoices for your subscription will automatically use the address details set in the owner company of the site.
To update these, go to the 'People' tab at the top of the screen:
From there, choose the 'Companies' section:
The owner company is identified by a green 'Owner' tag. When you select the owner company to view the details, you will see an edit pencil 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.
For more information see: Updating your payment details