you right-click on an image you want to post, and on the little box that pops up you click on “copy image address”
Then you paste that image address carefully between the quotation marks
Ugh...don’t want to hijack the thread...but
What browser do you use? I use mozilla firefox. I don’t get that normal choice when I right-click on the image on a FB url image
https://www.facebook.com/photo.php?fbid=10208584887013967&set=gm.1753921568189831&type=3