If you want to show you image, click on Image button and past the URL of the image, not the URL of the page showing the URL. For example, the following code:
will show your image:
in the page http://www.mediafire.com/i/?vn1jnmjzwug
One last tip: use Preview button to check how your message will render before posting it.
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Emmanuel Puybaret, Sweet Home 3D creator
