Need help to get featured image from post, instead of logo, to show on Facebook posting

My wife’s site has the Dante Theme. Our developer is no longer available.

When we post a blog post from her site, pollycastor.com to Facebook, instead of the featured image, we get a poorly cropped image of the logo. See the attached screen shot.

I need someone to figure out how to get the featured image from the blog post to show up as the picture on Facebook instead of the logo.
It may be a simple setting but I haven’t found it.

Our previous developer did a lot of custom work, which we don’t understand, so we need help.

Thanks in advance.

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