Nothing is displayed when I choose meta key on the settings page

After you choose “Meta Key” you should do the following:
– Go to “All posts”;
– Choose the post you want to be displayed by our plugin;
– Click “Edit”;
– Below the form of the post, you will see the following field: “Check ‘Key’".

If you want to display this post with Related Posts Plugin: 
– Check the radio button “Key”;
– Save the post;
– Repeat all these steps for each post you want to display as related.

This article related to Relevant plugin

Additional resources: Relevant - User Guide

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