This menu allows you to configure your system after the installation process is complete. At the minimum, you should probably set the root password and the system time zone. For extra goodies like bash, emacs, firefox, etc., you should look at the Packages item in this menu. For setting the timezone after the system is installed, use the 'Time Zone' item in this menu. For more information on the overall general system configuration, see the /etc/rc.conf and /etc/defaults/rc.conf files.