When typing your post or reply, click the IMG button above the text entry area. A dialog box will appear. Copy and paste the address (URL) into the dialog box and hit ok. This should add the code to display the image. The address for the image, if it is on your DIS web site would start out http://www.wdwinfo.com/sites/....
Try it here on the Tech board and someone will look at what you've done and help if needed.