I just made my first sound file/video using YouTube and found it to be very easy on my phone. Just go to your profile on the app, there's a red circle with a camera in it, tap it and start recording or, if you already have the video recorded, just select it from the list that pops up. Then upload that sucker and copy and paste the link into your forum post for all of us to view it. Honestly this sounds more complicated than the process actually is.
Good luck!