Your DNS entry will place in special servers the IP address of your server that hosts your site. such as for me my site mikeoconnor.net points to 174.133.40.66, when 174.133.40.66 gets a request for mikeoconnor.net it will pull up my web site. When you buy a domain, it is usally parked to point to the site of who you bought it from. They should have mailed you directions on how to change your DNS entry, so from there, you will take your hosting sites IP address that your hosting site gave you when you bought your web space, and go to the DNS management system, and point your domain to that IP address, at this point you have entered the new info, it can take up to 24 hours for this information to propagate out to rest of the internet. After you have entered that info and after the information of your domains new IP address propagates out, then you can point your web browser to your domain.
