WordPress SEO by Yoast allows developers to edit and customize SEO options like keywords, titles, descriptions, sitemap, feed, etc..
Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.
Here are some key features of "WordPress SEO by Yoast":
· Post titles and meta descriptions
· Robots Meta configuration
· XML sitemaps
· RSS enhancements
· Edit the robots.txt and .htaccess files
· Clean up head section
· Permalink clean up
· WordPress 3.3 or higher
· PHP 5.2 or higher