This plugin allows you to append a signature after every post. Some variables can be used, such as %post_title%, %post_link%, %bloginfo_name%, %bloginfo_url%, and so on. It supports multiuser.
- Upload the full directory into your wp-content/plugins directory
- Activate the plugin at the plugin administration page
- Open the plugin configuration page, which is located under "Settings -> WP Post Signature" and customize settings.
You can download WP Post Signature from WordPress.