First, go to your domain registrar and change the domain's nameservers to ns1.heliohost.org and ns2.heliohost.org. After that, go into cPanel and add the domain on the "Aliases" page. That will attach it to your account and make it show the same content as the gsakola.heliohost.org domain. Be aware that it might take a few hours to start working once you add it.
Don't worry - this is a fairly easy process. There is no need to bother about IP stuff, just enter the following nameservers:
ns1.heliohost.org
ns2.heliohost.org
Then, in cPanel, go to 'Parked Domains' and add your domain from there.
Voila! You're domain will be working in 24 hours!