So assuming your System Logs module isnt being used like mine and is sitting in Webmin>Un-used Modules>System Logs this is what you do.
click it, then choose Module Config. then choose “System Configuration” from the drop down
the settings you need to change are:
Path to syslog config file
Syslog PID file
Path to syslog server
Command to start syslog
Command to apply changes
Command to re-open log files
i found these settings in the boot-up and shutdown entry for sysklogd 's details/config, yours may be different so check:
/etc/syslog.conf
/var/run/syslogd.pid
/sbin/syslogd
/etc/init.d/sysklogd start
/etc/init.d/sysklogd reload
/etc/init.d/sysklogd restart ; /etc/init.d/sysklogd restart
choose save then “Refresh System Modules” in the left column near logout.
it will now be in Webmin>System