There is a tutorial around here someplace. It deals with having to open an account somewhere else and they use that service to provide a link that can be used here to display the image.
This is a truly wonderful forum but has the most convoluted image posting method of any other forum with which I engage. I have several websites - so I just upload an image to a directory on one of them and use the URL of that image to post here. That shortens the process for me a bit but still discourages me from posting many photos. 
If you are too busy to laugh, you are too busy.
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