This plugin helps change your Website's login page logo, background & to add a message option in your WP Admin page.
A. After install & activate the plugin you will get a settings page under your WP Dashboard. Check the Settings Page.
A. Yes. But we have pro version also here- http://www.webingnet.com/product/wp-login-welcome-pro/ . So you can upgrade to pro version any time.
A. There are huge difference between FREE & PRO VERSION. But the simple is- in free version, you get only 3 options. But in Pro Version you will get huge options. So you can customize the login page as your thinking, as your needs.
A. Its very simple. Just Deactivate the Free version, then delete the plugin from your dashboard. After than upload Pro version & Activate the plugin. You will see the imagine.