How to Hide WP FREE SSL - Free SSL Certificate for WordPress and force HTTPS WP SSL Pro Admin Menus

function plt_hide_wp_free_ssl_menus() {
	//Hide "WP Free SSL".
	remove_menu_page('wp-free-ssl.php');
	//Hide "WP Free SSL → WP Free SSL".
	remove_submenu_page('wp-free-ssl.php', 'wp-free-ssl.php');
	//Hide "WP Free SSL → My Certificate".
	remove_submenu_page('wp-free-ssl.php', 'certificate');
	//Hide "WP Free SSL → Force HTTPS".
	remove_submenu_page('wp-free-ssl.php', 'enablehttps');
	//Hide "WP Free SSL → Contact Us".
	remove_submenu_page('wp-free-ssl.php', 'wp-free-ssl.php-contact');
	//Hide "WP Free SSL → Upgrade".
	remove_submenu_page('wp-free-ssl.php', 'wp-free-ssl.php-pricing');
}

add_action('admin_menu', 'plt_hide_wp_free_ssl_menus', 1000000000);

Where do I put this code?