When setting up our AsteriskNOW 1.7 box there were a few things we thought we should note.
All of the config files for Asterisk are located at /etc/asterisk.
You may want to edit /etc/asterisk/manager.conf to adjust usernames and passwords. The default is user=admin, password=password.
In our case we wanted to edit /etc/asterisk/manager.conf and /etc/asterisk/http.conf to have the management and http systems only bind to the internal lan interface not the public interface.