WordPress.org

This section describes how to install the plugin and get it working. http://www.askapache.com/seo/404-google-wordpress-plugin.html

1. Upload the zip file to the /wp-content/plugins/ directory and unzip.
2. Activate the plugin through the 'Plugins' menu in WordPress.
3. Go to your Options Panel and open the "AA Google 404" submenu. /wp-admin/options-general.php?page=askapache-google-404.php
4. Enter in your Google Search API Key and configure your settings.
5. If you use a 404.php file, add to the body.