First, you need to register a domain name. Use a registrar like Namecheap to search for and register a domain (The steps to do this can be found here). This will usually cost you between $10 and $15.
Change the Namecheap Nameservers to Point to RAC
In the Namecheap control panel, find your domain and click on Manage
Under the Domain tab, select Custom DNS from the Nameservers dropdown (Please refer to this link for more information). Set the DNS servers to the following:
Select DNS Zones and click on create zone
Fill all information in DNS zones window
On DNS zone page click create recordset.
Select the record type to A.
Fill Name of your domain, description and other values and click submit.
Repeat steps 1 to 3 to create AAA recordset.
Alternatively, you can use the command-line tools: