Apache, PHP, MySQL all set - how do I change DNS info?

[NeilsPHP]

Hello,
I have finished installing apache,mysql and php on my own server to host my first
website.I have also created virtual host that works on my networks.
Can somebody help me figure out how can i change DNS A addresses in lookup table (DNS Zones ?)so my site can be accessible from internet.
Do I need to do it with the company I registered the domain or someplace ?

[jdMorgan]

Usually, yes, your registrar will provide DNS servers and a DNS Zone file editor, allowing you to point your fully-qualified domain name (ends with a period as in "example.com.") to the public IP address of your server.

Jim