How to Hide the "QS Core Modules" Admin Menu

function plt_hide_qs_core_modules_menus() {
	//Hide the "QS Core Modules" menu.
	remove_menu_page('QSCM42-Core-Settings');
}

add_action('admin_menu', 'plt_hide_qs_core_modules_menus', 11);

Where do I put this code?