Thanks for the screenshot, it's very helpful.
URL Format will be http://www.YOURDOMAIN.COM (maybe try a slash at the end)
Hostname can just be yourdomain.com
FTP works, but if it's got SFTP, that'd be even better, provided your user has shell access, as set in your control panel at DreamHost.
DocRoot will be /home/USER/DOMAIN.COM
Subfolder should be blank.