You don't "access" the nameservers, you point your DNS to them.
In other words, whatever service that you bought your domain name from should have a place for you to put ns1.heliohost.org and ns2.heliohost.org in as the nameservers.
I think I got it. With fear and trembling I replaced the old nameservers with these in the rudimentary 'control panel':
ns1.heliohost.org, IP: 65.19.143.4
ns2.heliohost.org, IP: 65.19.143.5
hope that's what you meant!