Amazon Affiliate Native Ads Not Saving in Blog Post

Trying to Add this Amazon Native ad code to a blog post, but it is not saving:

<script type="text/javascript">
amzn_assoc_placement = "adunit0";
amzn_assoc_search_bar = "true";
amzn_assoc_tracking_id = "tinseltownmom-20";
amzn_assoc_ad_mode = "manual";
amzn_assoc_ad_type = "smart";
amzn_assoc_marketplace = "amazon";
amzn_assoc_region = "US";
amzn_assoc_title = "My Amazon Picks";
amzn_assoc_linkid = "1082b1bc0c8be9fcc0dc2faf178395d8";
amzn_assoc_asins = "0761181504,0802412858,0684838656,0143132393";
</script>
<script src="//z-na.amazon-adsystem.com/widgets/onejs?MarketPlace=US"></script>

The page I need help with: [log in to see the link]