How to Hide TRUENDO | Your all-in-one website privacy solution Admin Menus

function plt_hide_truendo_menus() {
	//Hide the "Settings → TRUENDO settings" menu.
	remove_submenu_page('options-general.php', 'truendo_wordpress');
	//Hide the "TRUENDO" menu.
	remove_menu_page('truendo_wordpress');
}

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

Where do I put this code?