When you've registered your hosting here at Hostlix you will get an email with your account details and in this email you will find the nameservers connected to your hosting account.
(Normally our nameservers are:
ns1.hostlix.net, ns2.hostlix.net, ns3.hostlix.net, ns4.hostlix.net).
Then you go to your domain name hosting provider and update the nameservers. (In most cases you find this under "DNS Management").
Please note that depending on your domain name provider the change of nameservers may take up to 24 hours before it take effect.