To post an image:
Right-click the image on a web page. Left-click Properties.
The URL of the image will show near the center of the window.
Copy the entire URL and paste it in your post.
This example contains spaces which must be removed.
[ img ] URL [ / img ]
You can save time by copying this, removing the spaces and pasting it in a Desktop text document for quick access.
Give it a test-post for practice.