Which of the following are you trying to do?
a) Use actual, physical DNS servers somewhere else for a domain registered through, and hosted by, Dreamhost.
b) Make your whois info show ns1.your.domain instead of ns1.dreamhost.com, even though DNS is actually handled by DH.
I have registered the NS records through the "Manage Domains" admin panel.
By "registered", do you mean you added them as the authoritative namesevers for your DH-registered domain?
my nameservers are NOT showing up in any of the dreamhost nameservers.
Do you mean that your DNS server hostnames aren't resolving via the DH servers? If DH thinks they're authoritative for your domain, they won't check anywhere else. What do other, third-party, non-DH, nameservers say?
What's the actual domain name in question?
If you want useful replies, ask smart questions.