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1. Unzip the archive and put the folder into your plugins folder (/wp-content/plugins/).
2. Activate the plugin from the Plugins admin menu.

Basic usage

Go to your theme directory and open single.php.

Replace

previous_post_link(

with previous_post_smart(

and

next_post_link(

with next_post_smart(

Referrer link

If you also want to display a link back to the list of posts, add this line (also in single.php):

<?php referrer_link(); ?>

Posts with multiple categories

If you want for example to higlight the category that the user came from, you can use get_referrer_category() to retrieve the category object.

For further reference, all the template tags are located in smarter-navigation/template-tags.php.