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Ends up

Under the content of every post, on self-hosted WordPress.

1. 01 Load the script once, site-wide

   Appearance → Theme File Editor, or better, a child theme. Add this to functions.php so the script loads on every page rather than being pasted into each post.

   php

   add_action('wp_enqueue_scripts', function () {
       wp_enqueue_script(
           'addtosite',
           '//static.addtosite.com/widget.js',
           array(),
           null,
           true
       );
   });

2. 02 Append the buttons to every post

   Still in functions.php. Filtering the_content puts the buttons under the post body wherever your theme renders it, so a theme update cannot lose them.

   php

   add_filter('the_content', function ($content) {
       if (!is_singular('post') || !in_the_loop() || !is_main_query()) {
           return $content;
       }
   
       $kit = '<div class="ats_kit ats_kit_size_32"'
            . ' data-url="' . esc_url(get_permalink()) . '"'
            . ' data-title="' . esc_attr(get_the_title()) . '">'
            . '<a class="ats_btn_facebook"></a>'
            . '<a class="ats_btn_x"></a>'
            . '<a class="ats_btn_linkedin"></a>'
            . '<a class="ats_btn_email"></a>'
            . '<a class="ats_dd"></a>'
            . '</div>';
   
       return $content . $kit;
   });

3. 03 Or drop it into one post by hand

   In the block editor, add a Custom HTML block where you want the buttons and paste the snippet the configurator gives you. Good for trying it out before committing to the filter.