To start using a new debit or credit card in your Services account you would do the following:
1. Browse to https://www.blackmoonhosting.com and click the Client Log In menu.
2. Click the green 'Secure log in' button under Services & Billing.
3. Log into your Services account (Forgotten your password? Reset it here).
4. Click on the Billing > Payment Methods or Manage Credit Card
5. Now simply select the Set as default button next to the card you wish to use to pay for any service.