How do I upload the plugin separately to enable shadow-shop

[morning624]

I operate according to the readme in the shadow-shop plugin directory, but it doesn't work:

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== Installation ==

This section describes how to install the plugin and get it working.

e.g.

1. Upload shadowsocks-hub.php to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Place <?php do_action('plugin_name_hook'); ?> in your templates

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I uploaded the plugin and put the code in the theme header file, but it doesn't work.