xinetd and tcp wrappers question.

Newbies got my wu-ftpd working. I've tested it by the local address
127.0.0.1. and it works fine. When I try to access it from outside my
network I get errors that the service is unavailable. I guess this is
due to the hosts.allow file, tcp wrappers, not configured into the ftp
service.

I've checked the man xinetd.conf but the reference is for using
"only_from" to set allowable tcpips. What command do I use to modify
the xinetd service definition to point to /usr/sbin/tcpd ??
nb