"For specific help on changing the name servers at your domain registrar, go to their site ( i cannot find the site?)
you need go to the website from your domain registrar! >>> thats the website where you registered your domain name, NOT the 000webhost website.
you need know where you registered your domain.
if you dont, then try a whois lookup and check if for your domainname is a registrar info.
then when you are logged in in your account from your registrar look for the DNS/Nameserver settings and change it to 000hosting"s servers ns01.000webhost.com and ns02.000webhost.com.
if you can not find the section where to edit the DNS , then use the search or help FAQ site from your registrar.