I'm pretty sure (if I understand you correctly) that I did that already. If I hadn't then my site at
wouldn't be currently viewable, right?
In the DNS records for that domain, the "A" records points the domain to an IP address, and that is what makes your site 'viewable' to the internet. There is usually another DNS record, a CNAME record from memory, that should (possibly) be there.
But read up on those links first, and see how you go.