On the General tab, make sure you have selected the appropriate protocol (FTP or SFTP) as you have set up for your DreamHost user. (I highly recommend SFTP.)
Logon Type: Normal (username + password).
For "Default remote directory" (in the Advanced tab) you should have something like this:
These are the settings that work for me with FileZilla, so they should probably work for you, unless you have done something different with your site setup.