The Manage Registrations page is where you can register a new domain and manage current domain registrations you have with DreamHost. Domain WHOIS modifications (including nameservers) can be made from here, as well as registration renewal settings and domain locking.
View the following article for further details:
The Transfer Registrations page is where you can transfer a domain registration to or from DreamHost, as well as obtaining the domain’s authorization code.
View the following articles for further details: