The simplest way is to use a file hosting website like
www.mediafire.com to upload the file. It's free and easy to figure out. Upload the .ahf file and post the link that was given to you in the thread you'd like. I would also recommend you shorten your film to the particular portion you want people to see by using the "start select," "end select," and "copy select" in the film viewer. This will keep the files small and have people more likely to watch them. No one want to sift through 10 minutes of climb out to see a 10 second fight.