Well, the easiest way to do this is to just open up the file in paint and save it as a JPEG. It will take the first frame and make that into an image which should be easier to upload. Or, if you found it on the internet, just post the link from where it came from. Then people can look at it. If it's just on your computer, upload it to a site like
imagehost.org. Then you can post a link.