My Database is not working ..how i set up it
The database will be created and initialized automatically - see also the _db_mysql.php script for details.
Just make sure that _db.php points to the mysql backend (and not sqlite).
Also, check that the user specified at the top of _db_mysql.php has the correct permissions.
If you delete the database (or drop or tables) and start the application the db will be initialized again.