Thank you rlparker for your reply.
I can log on to DreamHost Control Panel. After that, I proceeded to create FTP user. After completing, I got the message,
"Successfully Created user xyz. It will take a few minutes for it to appear on your control panel"
But it never appears. And I cannot use the created user's username and password to log on using CuteFTP.
Same thing with MySQL Database. I created a couple of them, but they don't show in the list of created databases.
I had emailed support a few hours ago, but have not yet received any replies.
I bought this sub-account from an existing account holder. Maybe that doesn't make me master account holder? But I am the administrator of the account, coz I paid for it. I am not sure.