How do I change the Nameservers that my domain is using?

In this article:

In order to update domain nameserver information, you must first enable the "Advanced DNS modification settings"  You can enable these settings by doing the going to  Account > Preferences > Enable Advanced DNS modification. This will then allow give you the ability to update your nameservers. 

Once that setting has been enabled, you can update the nameservers for your domain by:

1. Log into your account and click on the Domains tab.

2. Enable the "Advanced DNS modification settings"  You can enable these settings by first:
         Account > Preferences > Enable Advanced DNS modification 
3. Expand the domain you wish to update by clicking the “Manage” button.
4. Click on “Advanced” and select “Change Nameservers.”

Note: Nameserver updates can disrupt web and email services. To avoid any undue downtime, please contact support before changing your domain's Nameservers.