Usually, at least with me, you have a link in your CPanel. If you have a good host you login and it should say something like Web Host Manager. You then click that link and it takes you to the spot to add a site. You then add a site and tell the person what their NDs (name domains). These can either be ip #s, specified names (ns1.yourhostprovider.com/ns2.yourhostprovider.com) or even your personal dns if you have a good host (ns1.YOURSITE.com/ns2.YOURSITE.com). Either way they have to have the domain name servers and they have to have been added to the account. If you pm me I can help you further for some rep and small NP$.