Hello there again
You need to login to the panel, The Add New User button on the DreamHost panel's Manage Users page adds a FTP/shell user.
Type of User Account
FTP is the default. SFTP works the same as regular FTP using a secure connection. Shell allows access to the web server's command line interface; shell users can also use FTP or SFTP.
Wiki here: http://wiki.dreamhost.com/Users_Overview
Be sure to let us know if you need further support HERE