You will need to have the subscription DomainNamePro. From the manager, click on Subscriptions > DomainName Pro. In the offer list click on the button Order.
A window will pop-up in the manager that will invite you to choose your domain name without the extension, as in .com, uk, or .fr.
You will then click on the button to Check availability.
emyspot.com questions the public database for the domain name. Whois is a large database that will show who and if the domain name is registered, then click on this domain belongs to you?