To purchase additional services you will need to be logged into your client area. You can login here: https://anvilnode.com/client/
Once you've logged in simply click the "Order new services" button under the shortcuts toolbar.
From here you can continue with your order and proceed with the checkout. When checking out while logged in you can use your credit/debit card that is already linked or account credit you may have on your account.
If you have difficulties or any questions please send us a ticket at: https://anvilnode.com/client/submitticket.php