First of all create a database and Run this sql query in Phpmyadmin then follow next steps...
CREATE TABLE IF NOT EXISTS `members` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(255) NOT NULL,
`sign_up_date` datetime NOT NULL,
`email` varchar(255) NOT NULL,
`bio`...
First create database in cpanel by Mysql Database Wizard.......
then define username password in your file eg.
<?php define('DB_HOST', 'localhost'); define('DB_USER', 'your_db_username'); define('DB_PASSWORD', 'your_password'); define('DB_DATABASE', 'your_db'); ?>