Domain Name System (DNS) is used to associate information with domain names. The classic example is to compare DNS to standard phone book, you look up the persons name who you wish to call and the phone book gives you their phone number. Similarly, DNS allows your browser to look up a hostname (URL) and it provides your browser with a corresponding IP Address where it finds your Web site.
Before you can use your own domain name with your x10Hosting account - you need to update your domain's nameserver - refer to the provider of your domain (who you got your domain from) for assistance.
you need to be sure both (2) are enter at you provider's Web site - and only these two (2)
Note that DNS propagation can take up to 72+ hours.