You can use the built in installer and upgrader, or you can install the plugin
- You can either use the automatic plugin installer or your FTP program to upload it to your wp-content/plugins directory the top-level folder. Don't just upload all the php files and put them in
- Disable any other News Sitemap generator plugin you may have installed!
- Activate the plugin through the 'Plugins' menu in WordPress
- Visit the Google News Sitemap settings (Settings - Google News Sitemap)
- Configure the options, all of them, else you will get errors in Webmaster Tools
- Login to your Webmaster Tools account and submit the newly created news sitemap