i have some posts where i wont use the plugin and others posts i dont wont to use. So on the posts were i wont to use it is possible to put a sortcode like [yarp] and in this posts appear the related posts.
I see. That’s something you could do with some custom code within your theme’s template files. You can check for certain text in the post content, or a particular custom field, and then call or not call related_posts() as appropriate.