Some country domains require that the host's nameservers (ie ns1.x10hosting.com and ns2.x10hosting.com ) be set up with the domain info (ie the IP where litesw.it will be located) before they will change the nameservers.
If that is what your registrar tells you , please include it in your post. The Admins will have to set up the DNS here by hand. Please also include whether you want the domain as an add-on or a parked domain.