How to Hide MIQID-Core Admin Menus

function plt_hide_miqid_core_menus() {
	//Hide the "MIQID" menu.
	remove_menu_page('miqid');
	//Hide the "MIQID → Dashboard" menu.
	remove_submenu_page('miqid', 'miqid');
	//Hide the "MIQID → Core" menu.
	remove_submenu_page('miqid', 'Core');
}

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

Where do I put this code?