Mr. Stevens, you have to use a third party image hosting site. Some use photobucket, and you can see the thread on the main page about "Photobucket test".
I was steered toward imgur.com by a board member years ago.
On imgur.com, you upload your picture and then you have an album & images.
On imgur you click on the image and options pop up.
One says "BBCode(messageboards&forums)"
Click on that and you will be copying the image, than you come here and right click on your mouse 'paste' and voila!
Here is an Ithaca Grade 4 live bird gun of mine.
Hope this helps.