Add below code in footer.php
<div class='NR-Ads jhfdiuh0' id='NR-Ads'>
<div class='NR-Ads-close' onclick='document.getElementById("NR-Ads").style.display="none"'><svg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'><path d='M278.6 256l68.2-68.2c6.2-6.2 6.2-16.4 0-22.6-6.2-6.2-16.4-6.2-22.6 0L256 233.4l-68.2-68.2c-6.2-6.2-16.4-6.2-22.6 0-3.1 3.1-4.7 7.2-4.7 11.3 0 4.1 1.6 8.2 4.7 11.3l68.2 68.2-68.2 68.2c-3.1 3.1-4.7 7.2-4.7 11.3 0 4.1 1.6 8.2 4.7 11.3 6.2 6.2 16.4 6.2 22.6 0l68.2-68.2 68.2 68.2c6.2 6.2 16.4 6.2 22.6 0 6.2-6.2 6.2-16.4 0-22.6L278.6 256z'/></svg></div>
<div class='NR-Ads-content'>
<center>
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-5588852356160244"
crossorigin="anonymous"></script>
<ins class="adsbygoogle"
style="display:inline-block;width:728px;height:90px"
data-ad-client="ca-pub-5588852356160244"
data-ad-slot="9807456969"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>
</center>
</div>
</div>