Oh man, that's not really gonna help much. I'm gonna guess it's wu-ftp...
Here's some info on doing that in wu:
Check the FAQ. However, you really might wanna figure out which ftp server you are using, if for nothing else, security (from updates and such). Try thumbing through xinetd or inetd in /etc Also, look at your services that are running: ps -aux
I'd be careful about running an FTP server without knowing at the very least, which one it is