Removing a DNS entry in server list for a zone

Hello Fred-Users, I have a little question, we need to change an existing NS record for some zones. On the user guide there is a clear reference on how to add an entry : https://fred.nic.cz/documentation/html/AdminManual/RegistryInitialization.h… With couple of exemples : fred-admin --zone_ns_add --zone_fqdn=cz --ns_fqdn=a.ns.nic.cz fred-admin --zone_ns_add --zone_fqdn=cz --ns_fqdn=b.ns.nic.cz --addr=1.2.3.4 But I need first to remove an old entry and I don’t see any « fred-admin —zone_ns_rm —ns_fqdn=… » or equivalent command. So what would be the right way to first remove an old entry then add a new one ? Thanks for your help. Sincerely yours.