WordPress.org

1. Expand the compressed archive in your WordPress plugins directory (most likely wordpress/wp-content/plugins).
2. Open WordPress and activate the plugin from the Plugins menu.
3. Configure ZenphotoPress. Open the Settings menu and select ZenphotoPress. Insert the URL of your Zenphoto gallery. That's it!

Please notice that you may need to clear your browser cache in order to see the ZenphotoPress icon in the rich text editor.