To use the User Logged Out Shortcode, go to the course or page where you'd like to use it.
Click the eLearnCommerce icon in the editor and select Miscellaneous -> User Logged Out.
As you click it the shortcode will be added to your editor.
What this does is that all the content that is between those two shortcodes is visible to Logged Out Users only.
You can use this to communicate with a user that logged out from your Membership Site.
To know more about eLearnCommerce's Visual Shortcode Builder, click here.