So can you save the photo/image to your computer at all?
That is the first step.
I save mine to My Pictures folder in the MY Documents section -and then make new sub folders for various topics.
art, pets, etc.

To post them here on most forums you use the attach files blow the reply box there is a bar that you may have to click the little arrows to expand the frame called - Additional Options .
then go to the part that says-
[Attach Files
Valid file extensions: bmp doc gif jpe jpeg jpg pdf png psd txt zip
] and follow those directions.

or add it to your profile album and then link or copy the code to place the image in a post.