Many times i manually setup wp blog but now my host is different and i can't setup wp blog its saying: On some systems the name of your database is prefixed with your username, so it would be like username_wordpress. Could that be the problem? what does it mean? plz reply me in details
Check that a) the database actually exists, and b) the username and password combination is right. If you're using CPanel, you can see the database details by clicking on the Databases icon.
What it means that is when you create you database the prefix can be automatically added. One common example of this is when you add a database via cPanel. Say my username on cPanel is zeldaze, if I add a database called wordpress, the database would actually be called zeldaze_wordpress. This is what it is warning you about. And as a side note the database prefix is not to get confused with the table prefix... Good luck!
but in wp-config.php file i need to write this. my prob has been resolved i was missing priviliges of db