To assign or update the nameservers for your domain (to point to your web host), please login to the billing/admin control panel.
If your domain is registered with us, in order to set up nameservers, login to your billing/admin control panel. Then go to "Account Overview" and click onto "View" next to the line "Number of Domains" and then on "Manage Domain." Now click on the "Nameservers" tab and enter the nameservers yoru host assigned to your hosting account for the dmain registered with us. The click on the button "Change Namesevers" in order to save your changes.