Wordpress image not showing up on Facebook

I am brand new to Wordpress and am using a free account.
When I share a blog entry to Facebook, the featured image does not appear with the link in Facebook.
This is the blog entry:
http://trudgingthrutheswamp.wordpress.com/2014/08/05/interpreting-the-creation-account-in-the-book-of-genesis/
Attached are screenshots of the featured image, how the share looks on Facebook, and the Facebook debugger showing the image as blank.jpg.
Thanks for the help
featuredimage.png
facebook-share.png
facebook-debugger.png
a1electricAsked:
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Brad GrouxSenior Manager (Wintel Engineering)Commented:
I had the same issue at one point with my blog, and following the guide outlined in this blog post cleared it right up - http://www.wpbeginner.com/wp-themes/how-to-avoid-no-thumbnail-issue-while-sharing-post-on-facebook/

One of the reason why you get no thumbnail, or unrelated thumbnail is because facebook’s script is not smart enough. On each page load, it searches for all image tags and display the ones that it finds useful. Sometimes the script times out without even loading the right image. To get around this issue, facebook recommends developers to tell the script exactly which image to pick by adding a meta tag in the header.
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a1electricAuthor Commented:
I'm brand new to Wordpress.  The help site says "You need to open your theme’s functions.php"
Can you tell  me how to do that?
thanks
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Brad GrouxSenior Manager (Wintel Engineering)Commented:
In WP-Admin navigate to Appearance -> Editor. On the right hand side of the edit screen you will see a list of all of the theme's files, click functions.php and that will open it in the edit window.

Be careful, make a copy of this file before editing it. You can hit CTRL+A in the edit window to select all, then CTRL+C to copy it to the clipboard, and then you can use CTRL+V to paste it into a notepad window.

I'd read this blog post before doing so, just to make sure you understand - http://richwp.com/how-to-edit-your-wordpress-theme-files/
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a1electricAuthor Commented:
While I'm looking for the files list, I'll show you what I see so far.  Attached are screen shots showing the Appearance option and then a Customize button, but I don't see "edit".  
The next screenshot shows what I see when I click the Customize button.
I haven't seen any files on the right yet.
thanks again
wpappearance.png
wpcustomize.png
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Brad GrouxSenior Manager (Wintel Engineering)Commented:
No, customize is not where you wan to be. See attached.

You can also use this URL to get to the page where you choose functions.php - http://www.yourdomain.com/wp-admin/theme-editor.php

NOTE: If you cannot access the Editor page, that may be a limitation of your free WordPress hosting.
D--Temp-Edit1.png
D--Temp-Edit2.png
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a1electricAuthor Commented:
Ok, I was afraid of that - must be a free account limitation.
See attached.
no-editor.png
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Brad GrouxSenior Manager (Wintel Engineering)Commented:
You may try a different theme and see if you have better luck with it working. Although, I'm guessing with the free version you are stuck with the default themes.
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