I don't think your post asks a very specific question. However if you are trying to configure an FTP client to work with dreamhost there are a number of different hostnames you can use. To make it simple, I personally just use the domain name that the dreamhost user is configured for as the hostname.
Also once you have logged in via FTP be sure to change to the directory named the same as the domain name you are working with. (when you log in you will land in your HOME directory, you should see a directory named the same as your domain name, that is where you want to be).
If you have additional problems please add more details, for example what FTP client you are using, and/or what error messages you are seeing.