I just add a Wordpress blog under a folder /blog/ under my domain name hosted on DreamHost. But I had tried to set up a sub-domain name to no avail. The sub-domain I tried to set up is like: blog.mydomain.com
The system just kept on telling me: "You can't add that domain: already in our DNS system."
In fact, if I type in the sub-domain name in the URL address field of the browser, it brings up phpMyAdmin page, where I can see database, SQL, status... all sorts of things.
Can anyone help me with it?