wu-ftp should come with your distro.
If you didnt install it at the start then the rpm can be found on one of your diskz.
To install a rpm type go into the directory where it is and type:
rpm -ivh (the rpm name and version).rpm
you can configure it in /etc/xinetd.d/wu-ftpd
to stor stop it use the command:
service xinetd start/stop/restart