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You’d use that code if you’re editing your theme files directly. In the classic editor you basically just type in the shortcode as is: [custom-related-posts]
http://help.bootstrapped.ventures/article/160-displaying-related-posts
Thanks, but in that case I must add the code in EACH post, that’s why I’ve recalled the php code hoping was the correct way…
Yes, that can indeed be resolved by editing your theme files and adding in that PHP code. But an easier way would be to use the widget. That should show up on every page as well.