You can't ask too many questions
We get a lot of our feedback from users on how to improve things, both by what isn't working or what features may be missing. Don't hesitate to come here first if you're running into issues.
For your problem, the Open Graph Image tag (og:image) isn't set on the page. The content on that page looks to be from K2. If so, please make sure you've enabled the Open Graph - K2 plugin. That should automatically detect and set an appropriate image for the page to use when shared.
You can test the page by running the page through our
Social Debug
tool. There's a handy listing of the tags that are detected as well as a preview of what a share would look like. After you enable the plugin, try running the page through that tool again.
I hope that helps, but if you run into any other issues, just let me know!
Thanks,
Alex