megdov on "Error establishing a database connection"

I am working on a school assignment that involves WordPress. I am trying to manually install it on my site on a subdomain, but I get this message when attempting to go to megendonovanmedia.com/icm507/wordpress and http://megendonovanmedia.com/icm507/wordpress/wp-admin/install.php (please excuse the long URLs):

"Error establishing a database connection"

I have "localhost" where it should be in the configuration file (and I'm 100% sure my database name, user and password are correct):

/** MySQL hostname */
define('DB_HOST', 'localhost');

I use Bluehost.com -- should I use something else?