Pre-Requirements

1. Install and enable Core Design Scriptegrator plugin.

First & Easy

1. Install the plugin.
2. Also publish the plugin.

How to create a footnote reference?

1. Open some article to editation (or create a new one).
2. Place {ref}...{/ref} marks where you want a footnote reference number to appear in an article. Type the text of the footnote between the tags (marks). Example:
   

   Lorem ipsum {ref}Some reference to Lorem Ipsum text.{/ref}dolor sit amet
   consectetuer ac velit nibh rutrum enim. Nam vel Pellentesque urna ut Mauris eget 
   eu justo ut id. Lorem ut et quam pretium tincidunt venenatis sit nec orci quis.

3. Footnote will be displayed automatically at the end of the current page.

How to create a reference to already existing footnote?

Use {refto FOOTNOTE_NUMBER} notation. That means:

Lorem ipsum {ref}First reference in this text.{/ref}dolor sit amet
consectetuer ac velit nibh rutrum enim. Nam vel Pellentesque urna ut Mauris eget 
eu justo ut id.{refto 1} Lorem ut et quam pretium tincidunt venenatis sit nec orci quis.

May I use asterisk instead of automatically created number?

Yes - you can. Just remember that the reference name has to be unique in case you have different footnotes on the page.

Lorem ipsum {ref name="*"}Some reference with asterisk.{/ref}dolor sit amet
consectetuer ac velit nibh rutrum enim. Nam vel Pellentesque urna ut Mauris eget 
eu justo ut id.

Content - Pagebreak plugin & multiple pages

In case your article is separated to multiple pages, please make sure that Joomla! "Content - Pagebreak plugin" is loaded BEFORE Core Design Footnotes plugin.