How to Remove extra content

If I Like an article, it displays correctly, but I HAVE to add my own comment in order to post.

Like does not require a comment. In your screenshot, there is a checkmark next to the like button, meaning it has already been liked. If you hit the close button, the URL will still be liked. When you then hover over the like button and see an X, it also means that's it has been liked and you can remove the like by re-clicking on the button.

If I SHARE an article, it displays the image and the content from the site some where under

This is the way Share works. You are sharing a URL and Facebook adds context to it in their news feeds with the url, description and image. JFBConnect has no control over the above.

plus, i really want to remove the user in anything else I share

We suspect that there is some extension on your site (whether the Joomla content or something else), that is added a metatag for author. View your page source and see if this is present. If so, you will need to figure out how to remove it. Then you will need to try re-scraping your page to see if the preview has changed. You can re-scrape via our site socialdebug.com or the Facebook Open Graph Debugger at developers.facebook.com/tools/debug/ by hitting the Debug button, then Scrape for new info button.

-Melissa