You can upgrade to a Pro account on BuiltWith by visiting the Plans & Pricing page or following the steps from your dashboard in the screencast shown ...
The demo shows you how to cancel your subscription.
This demo shows you how to enable 2FA on your account. If you are logged in, jump to the 2FA setup page here - https://builtwith.com/2fa-setup.
This demo shows how you can use the billing screen at https://payments.builtwith.com to access invoices and receipts.
This demo shows how to add a VAT or any Tax ID you like to BuiltWith.
This demo shows how to add a billing address to your invoices.