FreeBSD does not use proftpd by default, if you really feel you need FTP services, just uncomment the FTP line in /etc/inetd.conf, check you have enable_inetd="YES" in /etc/rc.conf, and either start or restart inetd as root (restart using 'killall -HUP inetd' or start it by entering 'inetd').
Additionally there is no need to fiddle around with adding users and changing ownerships (chown) as it's already done in FreeBSD.
Cheers,
P.