How to Register a Domain Name – Amazon Web Services

b. Click the Register Domain button.On the next screen, enter the domain you want in the Choose a Domain box (cloudexamples is shown in the image, then select a Top Level Domain (TLD) (e.g. .com, .org, .co.uk, etc.) And click the Check button to see if the domain is available.If the domain is available, click the Add to cart button and scroll to the bottom of the page to click Continue.

https://aws.amazon.com/getting-started/hands-on/get-a-domain/