FTP problem

I’ve just transfered my hosting services from Featured Price
Hosting to Dreamhost. When trying to publish my files from the
local directory to the public, I get an error messsage saying that FTP host could not be found. I DO NOT know what process I have to go thru to transfer my Domain name (that I purchased from Featured Price) over to Dreamhost - I have a feeling this is the problem. I’m using Dreamweaver to FTP. Please advise as to what I should do. Thanks in advance for your support.