That’s the link to the html page the pic is posted on. You need the actual link to the pic on the page. There’s a tab on the RHS of the page that says “Image Links”. Click that for what you need. Pick the one that says “IMG code”. You can paste that directly in the post just the way it is.
Read this, it will help.
You can see how this is done if you quote this message to see it in the editor.