Check your welcome email for what nameservers you will need to enter. If you need them again, please open up a support ticket so we can get them to you.

To Modify the Nameservers for Your Domain

1. Log in to your Account Manager.
2. In the My Products section, click Domain Manager.
3. Use the checkbox(es) to select the domain name(s) you want to modify.
4. Click Nameservers.
5. Select Custom nameservers.
6. In the Nameserver fields, enter the nameservers. You must enter at least two for your hosting account.
7. Click OK.

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SOURCE : http://help.godaddy.com/article/667