Are you referring to an image from SU or the actual file? If you mean an image, then just export it from SU, upload it and then insert into your thread just like any other image. If that's now what you're wanting to do, please elaborate.
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152)