In this section setup the catching device tag selector. There is tou elements.
Title bound element & Article bound element usually h1 / h2 tags.
If was not set plugin simply assume that tag is h1.
Same is valid for Article bound element selector tag. 
Last is the expression for button that user will see on right and above of related articles. And select / deselect the article.
As you see you can customize that button as you wish. If something goes wrong then simple clear the text area field and save the plugin. After saving Default button will be recreated.
v 2