Need help clearing an error on my website

Databases
1

How can I clear this error message listed below, :confused:

Warning: mysql_selectdb() [function.mysql-selectdb]: Access denied for user ‘nobody’@‘localhost’ (using password: NO) in /home/dreamhom/public_html/thankyou.php on line 3

Warning: mysql_selectdb() [function.mysql-selectdb]: A link to the server could not be established in /home/dreamhom/public_html/thankyou.php on line 3

2

PHP was unable to first connect to MySQL and so it would not be able to select a database to work with. Check that the hostname, username and password are all correct.