In order for your domain to resolve to the respective host, you need to set your DNS (Domain Nameservers) to point towards the DNS that your host gave you upon sign up.
DNS Records will look something like this:
ns1.hostingdomain.com
ns2.hostingdomain.com
If you purchased a domain name from Twenty70, you can modify the DNS records at anytime by simply logging in to your Dashboard account, Selecting My Domains, and clicking to "View Details" icon located next to the purchase price.
