Facebook Open Graph, Google+ and Twitter Card Tags

Hello, I’m not able to set up / use “Facebook Open Graph, Google+ and Twitter Card Tags”.
When I want to share a property like this one: https://maglobalproperty.com/property-search/36-House-Pattaya-Chonburi-THB11500000/

I’m not able to edit anything manually in the post.

I have already validated my website on Facebook Business, but nothing changed.

What could / should I do?

Regards,
Mike

The page I need help with: [log in to see the link]