Ah that's it. The form enters the values into the database but the wp-config sets CONSTANTS
If you look for a top level file called wp-config-sample.php you'll see
PHP Code:
// ** MySQL settings - You can get this info from your web host ** //
/** The name of the database for WordPress */
define('DB_NAME', 'database_name_here');
/** MySQL database username */
define('DB_USER', 'username_here');
/** MySQL database password */
define('DB_PASSWORD', 'password_here');
/** MySQL hostname */
define('DB_HOST', 'localhost');
/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8');
/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');
change the values to match what you set them for then save as wp-config.php in the same folder. (don't just rename the "sample" file, you may want it later for reference)
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