{source}
<!-- You can place html anywhere within the source tags -->
<script language="javascript" type="text/javascript">
// You can place JavaScript like this
</script>
<?php
// You can place PHP like this
?>
{/<iframe width="685" height="514" src="https://www.youtube.com/embed/BT5ATk-ANHY" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>}