To change the nameservers of a domain, you need to log in to the Domain Management System using the credentials that have already been provided to you or that you created during registration.
Once logged in, go to the "Domain Management" menu. There, you will see all the domains you own, and you can select (by clicking) the domain you wish to modify.
Next, a menu with various fields related to your domain will appear on the right side of the page. In this menu, there is a field titled "Nameservers." You can replace the existing nameservers with the new ones and click the "Change Nameserver" button.
