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There are two things you need to do. First, copy and paste the code in your function.php file. Second, find the single.php in your theme folder. This file is the template of posts. Duplicate it, and rename as single-{Post ID}.php. add_filter( 'single_template', 'check_post_custom_template'); function check_post_custom_template($template){ global $post; $custom_template = locate_template( "single-{$post->ID}.php" ); if ( ! empty( $custom_template ) ) { $template = $custom_template; } return $template; } And how to get your Post ID? You can enter the post edit page, then get it in the link. For example, the edit page link of the post is below, and “post = 123456” is your post ID. https://aronhack.com/wp-admin/post.php?post=123456&action=edit Related Posts The Complete WordPress Customization Tutorial – Just Copy And Paste And Work