You need to change the default password for Asterisk freePBX or else the entire world will know it. You can do it by SSH to the server and typing:
mysqladmin -u asteriskuser -p password newpass
It will then prompt you for the old password which should be amp109 then it will be changed.
Once it is changed you must update the following files:
/etc/amportal.conf
/etc/asterisk/cdr_mysql.conf
/etc/asterisk/res_mysql.conf