how do I insert an image thats on my site already into editor control

I am using the editor control, and I find that I can paste articles in, with images.  For instance, if I paste an article in from the "New York Post", the images appear, and the underlying link is to the Post photo, even if the article is now saved in my database (a sql server database) for future viewing on another webpage.

The problem is this - maybe one day the Post will take down the photo.  So its better to save the photo to my server, and refer to that version of the photo.  

But how do I do that?  I don't seem to be able to put a IMG SRC tag into the Editor.

Thanks,

P.S. (in reality I would not be posting proprietary articles from the Post, but I would be getting articles from various sources).