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1. Upload 'seo-slugs.php' to the '/wp-content/plugins/' directory.
2. Activate the plugin through the 'Plugins' menu in WordPress

Now, when editing a post, give it a title and press Save and Continue Editing. The SEO Slugs plugin will generate a slug. If you edit it, the plugin will honor your slug and won't change it.

If you find this plugin useful, please, link to this page: SEO Slugs Wordpress Plugin