On sidebar.php, in your theme’s folder, you should find this code
<!-- ADS start -->
<div id="right_ads">
<div id="right_ads_top">
<div class="right_ads_item">
<a href="#"><img src="https://www.josephhinkle.com/wp-content/themes/Office/images/!ads.gif" alt="" /></a>
</div>
<div class="right_ads_item last">
<a href="#"><img src="https://www.josephhinkle.com/wp-content/themes/Office/images/!ads.gif" alt="" /></a>
</div>
<div class="right_ads_item">
<a href="#"><img src="https://www.josephhinkle.com/wp-content/themes/Office/images/!ads.gif" alt="" /></a>
</div>
<div class="right_ads_item last">
<a href="#"><img src="https://www.josephhinkle.com/wp-content/themes/Office/images/!ads.gif" alt="" /></a>
</div>
</div>
</div>
<!-- ADS end -->
In <a href="#">
add the link of the banner in place of #
.
In img src
, put the path to the banner image.
If you have a Google Adsense account, or the like, replace the content of each <div class="right_ads_item etc.>
with the code they give you.
That should work.