This is something your domain provider has to offer to you. It is usually a paid service. Not all TLDs allow it though - so depending on your domain ending you might be out of luck. I don’t know your intentions, but if you want to evade prosecution because of the traffic going through your TOR node this will not work. Even with whois privacy enabled your provider must disclose your identity to prosecution. Even if they weren’t the A record (IP address) of your domain would link the domain to your server and would open another way to identify you through your hosting provider or ISP.