You need to right click(PC) or Control click (Mac) the image on the page you linked and select "Copy Image URL", then go into the Insert Image icon on your post and paste the image URL. Then you'll get the image in the post.

That said, when I first posted, I had your image in my post, but I edited my post and removed it because it was HUGE. So please be aware of this and only post the full image if you absolutely need to (and if you only need one small section of it, crop it using an image editor).