Set your nameservers in your domain's control panel to "ns1.x10hosting.com" and "ns2.x10hosting.com". Log into your cPanel account and either park your domain, add it on as an add-on domain, or change your subdomain to your domain, via the
Hosting Account Panel. Please be aware that it may take up to 48 hours for the DNS Servers to propagate and you will be able to see your website at that time. Hope I've answered your original question and any other questions you may have had.