AdminCP >> Setup >> Advertising >> Add Advertisement or Select Position
In the text box for HTML, something like this:
Code:
<center>
<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- BW_Responsive -->
<ins class="adsbygoogle"
style="display:inline-block;min-width:300px;max-width:728px;width:95%;min-height:90px;max-height:200px;height:200px;"
data-ad-client="ca-pub-123456789"
data-ad-slot="123456789"
data-full-width-responsive="true">
</ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>
</center>