If you have the image loaded in IMGUR 1.)click on the image you wish to post 2.) This should bring up another window with 6 menu options on the right hands side of the thumb nail picture you see. 3.) chose the option all the way at the bottom. 3.)
Linked BBCode (message boards). 4.) click the blue button at the bottom to copy the url. 5.) Paste that information in the message window. 6.) then preview to make sure the picture copied. See examples below: