After you've downloaded and extracted the files:
- Upload the complete 'wp-cms' folder to the '/wp-content/plugins/' directory
- Activate the plugin through the 'Plugins' menu in WordPress
- You're done. Wordpress is now a CMS.
You can access the WP-CMS settings via the "settings" menu to toggle blog functionality.
Uninstalling
To uninstall WP-CMS:
- Delete the "home" page with the content "thanks for using wp-cms" (if it was created).
- Go to "Settings > Reading" and change these options back to whatever you like.