In order to modify your nameservers on a domain name purchased through GoDaddy you can follow the steps below:
- Go to the GoDaddy site at http://www.godaddy.com
- Click the "My Account" link
- Enter your Login Name or Customer Number and click the Login button
- Under "Manage Your Accounts" pull down the drop down menu next to the domain you wish to modify and select "Name Servers"
- Click "Go"
- Make your nameserver changes