Prevent a page from getting indexed by search engines

• Add a text/gallery module to the page
• click the <> tool in the editor (the module will turn black)
• paste in this code:

<script>
    var rmeta = document.createElement('meta');
    rmeta.name = 'robots';
    rmeta.content = 'noindex';
    document.head.appendChild(rmeta);
</script>

• Leave the page set as Unlisted
• Save the page.