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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.

Your feed, on steroids : add a custom footer to RSS items with, for example, a copyright notice, a “Read More (400 words)” links, an “Add to del.icio.us” link, a list of related entries, or anything really (even custom PHP functions). Compatible with Feedburner or similar services.
Improve connectivity between your feed and your site !!
For documentation and tips, please refer to the official plugin page for <a href="http://planetozh.com/blog/my-projects/wordpress-plugin-better-feed-rss/" title="Better Feed" rel="nofollow ugc">Better Feed</a>

Ozh' Better Feed

Your feed, on steroids : add a custom footer to RSS items with, for example, a copyright notice, a "Read More (400 words)" links, an "A …

Really Simple Related Posts Plugin vs Ozh' Better Feed