I would bet you do not have aRts installed, and that is why the information you were given is not working.
Fedora, and many others have decided to provide Pulse Audio as a sound server. See this link.
I'm not saying Pulse Audio is perfect, it is not. There are many bug reports on it. However, it works well enough on my Mnadriva system.
Try Pulse Audio first. If you can not get the sound server to work, then you would have to install aRts and configure it. Just understand, that is not where most sound apps are going.