Step 1: Login to the domain Dashboard.
Step 2: Select any domain and click 'MANAGE' button.
Step 3: Click 'Edit' button under Name Server.
Step 4: Click 'Register Name server' button on the Modify Name server page.
Step 5: Enter the new name server address. Optionally, enter the ip address of the new name server.
Step 6: Click 'Register Name Server' button to submit the new name server.