[Golzarion]

my forum is not located under root....was changed long ago for security reasons....can I point the red text to any folder of my choosing where the forums are located?

I guess this is the point! Please check that the folder "mp3" exists on your forum main directory , I mean the place where your forum files and folders are existed.
and check the folder permission again.
for example if your forum path is something like :

www.yourdomain.com/forums/forum.php

Then your "mp3" folder should be on :

www.yourdoain.com/forums/mp3

I hope it would be helpful