Log in to godaddy and change the nameservers to
You don't get instant joy when making that change, it will take about 24 hours to be published around the world. (technical term: DNS propagation)
There are other ways of setting up a new install before changing DNS over, but honestly if the domains are just parked at godaddy and not live at godaddy the simplest thing to do is just change the nameservers. Why add a level of complication when you don't need it.
However if your interested in making it more difficult, here's how you do it: