How to Hide UniPixel Admin Menus

function plt_hide_unipixel_menus() {
	//Hide "UniPixel".
	remove_menu_page('unipixel');
	//Hide "UniPixel → UniPixel".
	remove_submenu_page('unipixel', 'unipixel');
	//Hide "UniPixel → Meta Setup".
	remove_submenu_page('unipixel', 'unipixel_setup_meta');
	//Hide "UniPixel → Google Setup".
	remove_submenu_page('unipixel', 'unipixel_setup_google');
}

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

Where do I put this code?