After purchasing a Certified Domain credit, you can apply it to one of the domains in your account.

To Apply for a Certified Domain Validation
Log in to your Account Manager.
In the My Products section, click Manage Certified Domain.
Click Setup Account for the Certified Domain account that you want to set up.
From the Domain Names list, select the domain for which you want to submit a Certified Domain request, and then complete the following:
First Name
Enter your first name.
Last Name
Enter your last name.
Country
Select the country in which you reside.
Phone Number and Ext.
Enter your phone number, and, if necessary, your extension.
Email Address
Enter your email address.
Organization/Company Name
(Optional) Enter the organization or company name with which the domain is associated.
Enter your contact information, and then click Next.
On the Confirm Information and Agree to Terms of Service page, review the information.
Review the Subscriber Agreement, and if you accept the terms, select Accept Subscriber Agreement.
Click OK.