Dunno if it's too late where you are, but does DNS resolve for your domain?
Anyway, until then, you can connect directly to your web server. If you don't know what your web server is, click on "Account Status" in the upper right hand corner of the panel and among the stats will be your web server name. Let's say it's "blah". You should then try to ssh to blah.dreamhost.com.
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