When you print screen it will open up in paint. You will have to save it and open it up in your editing program. When you are done editing it you should save it as a jpg file. Then you can either loaded up to a place like photobucket and link it from there (make sure you copy the code for UBB forums) or you can download it here as an attachment. Once it's posted, go to the attachment and copy the url. Go into edit on your post, click on image, and post the url in. Hit Continue and then your picture will be in the post. If you want to post more than one pic then it's my suggestion just to post a number of links from a place like photobucket.