Login to your control panel at https://cp.domaincheck.co.uk/cp
Click on the Account tab
Click on Register New Domain
Enter your desired domain name and tick any TLDs that you want to check for
Click on Check Domain
Tick any domains you want to buy and they will appear in your Shopping Cart
If you want to add a hosting package to this domain name click on the Website and Email Hosting tab and add the packages you want Click on Checkout when you are finished to start the payment process.