1. First login to your Customer Centre account.
2. Click on the Domains menu and select My Domains.
3. Find the domain on which you'd like to create the nameserver and click on the Manage Domain button next to it.
4. Click on the Nameservers tab in the new window that opens. It will show a list of nameservers on your domain.
5. Modify as needed and save by clicking on the Change Nameservers button at the bottom.