How to Hide the "PJ News Ticker" Admin Menu

function plt_hide_pj_news_ticker_menus() {
	//Hide the "Settings → PJ News Ticker" menu.
	remove_submenu_page('options-general.php', 'pj-news-ticker');
}

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

Where do I put this code?