Hi,

1/ It's featured boxes display below the slider - like on this image: http://prntscr.com/nj2l9u

You can check options for Featured Boxes via Customize > Homepage Options.

2/ Because you've missing the code from google ads. I see you just put this code:

<script>
     (adsbygoogle = window.adsbygoogle || []).push({
          google_ad_client: "ca-pub-2412115694936576",
          enable_page_level_ads: true
     });
</script>

While a full google ads code will look like that:

<script async="" src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({
          google_ad_client: "ca-pub-2412115694936576",
          enable_page_level_ads: true
     });
</script>

Best Regards,

PenciDesign