At the command line, change to root.
and then the root password. Run
Then reinstall it and xmms-mp3:
yum install xmms xmms-mp3
This get you back to the Fedora built version of xmms.
Yum is a software updater that works with rpm packages.
If you copy this
yum.conf to /etc/yum.conf (as root), you can uncomment some more software repositories outside the default Fedora, like xmms-mp3 from freshrpms. Open /etc/yum.conf with a text editor and remove the # in front of the entries you want to use, like freshrpms for xmms-mp3.
Now you should be ready to rock.