I assume that you mean posting an image. If so, then you first need to have them stored on a hosting site like photobucket. Then you can either copy and paste the link from their site in the IMG bracket context or press the insert image button on the posting toolbar and enter the http location of the image and it will do the IMG brackets for you. I cannot show you exactly what it should look like b/c the post will think I am inserting an image myself and it will just show as a broken image link.
Kevin