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Both the RPM and tarball installations provide a default configuration with a readonly anonymous FTP area and full regular access to users on the system. This is a good starting point if all you want is to offer anonymous FTP access.
The configuration file for ProFTPD is /etc/proftpd.conf or $prefix/etc/proftpd.conf if installed from source. The anonymous FTP users are chroot( )ed into the home directory of the FTP user, often something like /srv/ftp/.