Each photo on a webpage has its own Internet address (URL), just as the page you're now reading has one.
Here's how to get it:
Hover your mouse over a photo and right-click (Mac: command-click). A menu like you see on your right should appear.
Choose
properties. A dialog box similar to what you see below should appear:
Make sure the dialog box is wide enough to see the entire URL. Then Right Click/Copy the URL.
Important detail:
The URL must end in .jpg or .gif. If it doesn't, you may have missed copying the right-most part. Or you have the URL of the
page the photo lives on, but not the URL of the photo itself.
Now you need to place the URL in another web page. How that's done depends on the page. In a message forum, there is typically an IMG or graphical button
that appears when you compose a message. Clicking that button displays a pop-up window for your photo's URL.
Paste your URL into the space provided.
And that's it!