How to Switch back to the Dreamhost Nameservers your domain.
(You can only change the domain nameservers at your registrar)
Start by going to your Registrations Page :
Find your domain:
On the next page you will want to select the nameservers tab:
Then you will want to use the dreamhost Nameservers
Click Save Nameservers
Then the nameservers will need to update on the domain. Once updated in the system, then the domain will propagate.
You can check on propagation on site that check propagation like :
Please note dns changes can take 4-48 hours to fully propagate across the internet.