To point your domain to your new site on Builder by SiteOrganic you need to login to your domain registrar (usually at a place like Register.com, Hover, GoDaddy, Network Solutions, etc.) and change the DNS to point to the following name servers (2 are essential, all 4 are preferred if possible):
ns1.siteorganicbuilder.com
ns2.siteorganicbuilder.com
ns3.siteorganicbuilder.com
ns4.siteorganicbuilder.com
This will commence the process of switching over to the new Website; the process normally takes anywhere from 4 to 24 hours to complete.