marcinmrowiec

To display related posts just add shortcode [getrelatedposts] or with attributes [getrelatedposts title=”your title” relation=”tags/category” numberofposts=”somenumber” ] to your post page. 
You can change global plugin settings in RSRPP Settings.
At first use plugin will create template “rsrpp-template.php” in active theme directory.

Really Simple Related Posts Plugin

Really Simple Related Posts Plugin - plugin for displaying related posts using shorcodes with your own template.

Gerasimos Tsiamalos

Anastis Sourgoutsidis

Most of the “related posts” plugins out there while they provide some kind of control on how to create related posts, they all rely on an algorithm 
and the results are automatic. With CPTR you get total control as you can manually select the posts that you want to relate.

Custom Post Types Relationships (CPTR)

This plugin will let you create custom post relationships among posts, pages and custom post types.

Really Simple Related Posts Plugin vs Custom Post Types Relationships (CPTR)