Mike,
You're correct that the Open Graph *Actions* feature of Facebook has been severely limited in recent months. We still have documentation available for that feature as there are users using it and are able to through the end of this month. However, I don't think that's what you're looking for at all.
Facebook has a lot of things under the "Open Graph" umbrella. The main things you likely care about are Open Graph tags. Those are hidden tags on the page to let Facebook know how to show your page in a user's stream when it shows up. With the tags, you can set the title, description, image, etc for the post.
So all I wish to happen is that when a visitor clicks on the FB Share button, they see a pre-defined picture and also have the option to write some additional words to post to FB.
Do the following:
* On the /fb-share page you have, edit the content of the article that's shown on that page and add the following text:
{SCOpenGraph title=Title for the page}
{SCOpenGraph description=Description for the page}
{SCOpenGraph image=http://site.com/link-to-image.jpg}
* Update the info in those tags appropriately
* Go to the
Facebook URL Debug Tool
* Debug your page and hit the "Scrape Again" button to make sure Facebook re-scans the tags you just set
* You should see a preview of what a post would look like
Now, when someone shares your page, the post should show up how you want. I can't tell if you got the FB Share Button to work properly above, but from your settings, it seems like it should. If not, let us know exactly where you're having difficulties and where we can see the share button you're trying to use, and we'll gladly help investigate further.
Thanks,
Alex