We are providing DNS services only, not registration services. You must instruct your registrar to use the nameservers ns1.mydyndns.org, ns2.mydyndns.org, ns3.mydyndns.org, ns4.mydyndns.org, and ns5.mydyndns.org for your domain. (Note: If your registrar will not let you input this many servers, leave off higher numbered servers; only ns1 and ns2 are absolutely required for activation, but we strongly recommend listing as many as possible with your registrar.)
(do i need to do this even when hosting my own site ?)