You can add an advertising banner in the header part of the newsfeed theme.

https://support.themeix.com/wp-content/uploads/2021/07/image-3-1024x234.png

Openheader.hbsfile and then add the following code inside thenavbar-brand-wrapper

<a href="#"><img class="lazyload" src="{{asset 'images/blog-ads.png'}}" alt="{{t "nf-ads"}}" /></a>

You can add iframe ads there too