fp, you need to get the actual image url if you want to include it in the post. The actual image url will end in ".jpg" The link you have is to a page that basically "wraps" or contains the image.
If you're on a PC you should be able to right click on the image and select "Copy image address" or something similar and you'd get this: https://i.imgur.com/5ZjBDYL.jpg on your clipboard.

Then put that in the img tags.