Once the plugin is activated it will create a sidebar in Appearance>Widgets. Any widget that you place in that sidebar will get displayed within the post content. You specify what HTML element the widget content shall appear after.
For example, if you know that you have three
<p> tags in your post and you want an advertisement to appear after the second
<p> tag, then on that post you can set the widget to display after a ‘p’ and after 2 elements.
Sample configurations on the WordPress Widget area
View of the Post editor without any interlaced content, because authors don’t have to add it!
Interlaced widget content in the post content!