To modify/register your private nameservers of your domain registered with KnownHost Login to my.knownhost.com
Click on "Manage" next to the domain name you wish to update
Once you click manage you will be redirected to the below
The next step will be to click "Register Name servers" then you will be redirected to the following
Enter your new Name Servers followed by the IP address once you update your Name Servers click "Update All Hosts"
If you have any questions regarding this don't hesitate to open a ticket by logging into support.knownhost.com