If you have existing domain you will need to change your nameserver to point to our server. You can add your existing domain to your account in cPanel. This change can take up to 48 hours to take effect. Our nameservers are:
ns1.x10hosting.com
ns2.x10hosting.com
pero si me meto en ns1.x..... me salen una web rara :/ es normal?
Si, como Kansy dice, los NS son "Name Servers", y solamente se colocan para dirigir tu dominio a los servidores de x10hosting, y así poder alojar tu dominio en su hosting.