Is this a new install or an install that was done awhile ago? Cause I know during the initial install you can choose to not install it but after that it's not something you can just uninstall. You could, in theory, if you have RDP access to the server, can just use the server manager to uninstall the Microsoft DNS server but the better option would be to simply stop and disable the service.
Is there a specific reason you want to disable it completely on the server though?