What is DNS and how do I point it to a particular web server?
DNS means Domain Name Server.
When you own a domain name such as www.whatever.com, you own a name that has a subsequent pointer to a computer (server) on the Internet that runs your site.
Go to www.betterwhois.com and type in your domain address. The results will tell you several things. Read more about What is DNS and how do I point it to a particular web server?