Create New Admin User if you forgot username and password of admin user. You need to have cpanel / FTP access of your site.

new-user.php

<?php
/*
 * Create Admin User
 */
 
$wp_password = 'PASSWORD'; #enter your desired password here, if you don't line 16 makes sure nothing bad happens like setting you actual password to 'PASSWORD'
$wp_username = 'new-admin';
$wp_email = 'email@domain.com';
 
if ( $wp_password === 'PASSWORD' )
	die;
 
require_once('wp-blog-header.php');

if ( !username_exists($wp_username) && !email_exists($wp_email) ) {
	$user_id = wp_create_user( $wp_username, $wp_password, $wp_email);
 
	if ( is_int($user_id) ) {
	  $wp_user_object = new WP_User($user_id);
	  $wp_user_object->set_role('administrator');
	  echo 'Success!';
	} else {
	  echo 'Error with wp_insert_user. No users were created.';
	}
} else {
	echo 'This user or email already exists. Nothing was done.';
}