WordPress.org

1. Upload the solr-for-wordpress folder to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Configure the plugin with the hostname, port, and URI path to your Solr installation.
4. Load all your posts and/or pages via the "Load All Posts" button in the settings page.

Custom Theme Integration

1. Create a new theme file called "s4w_search.php".
2. Insert your markup, use template methods s4wsearchform() and s4wsearchresults() to insert the search box and results respectively.
3. Add result styling to your theme css file, see solr-for-wordpress/template/search.css for an example.
4. You can use the search widget in your sidebar for search, or use a custom search box that submits the query in the parameter "s".