There’s isn’t a way to reuse footnotes built-in to the plugin currently. It’s been a commonly requested feature so it’s on the roadmap.
If you need the tooltip to appear the only way to do that is going to be using the [note][/note]
shortcode. Which would require you to reenter the footnote.
You can link to the footnote at the bottom of the page by targeting the footnote ID which is created as #easy-footnote-bottom-{footnote number}-{post ID}
.
So the link to the first footnote on the post with the ID 402 would be:
#easy-footnote-bottom-1-402
To put that directly in your post you would need to use the text tab and add this in where you’d like the footnote to appear with the proper href set:
<sup><a href="#easy-footnote-1-402">1</a></sup>
Again that won’t display the tooltip on hover. That has to be done using the [note]
shortcode. If you do that you will have duplicate notes at the bottom of the post.
I’m hoping to get a new version out allowing for re-using notes sometime in the future but have no release schedule currently.