/var/www/html/xerxes-frontend/scripts/create-mysql.sql

Specify passwords for the Xerxes admin user and the cyrus user.

INSERT INTO adminuser (username, password) \ 
    VALUES ('admin', '<whatever you wish>');      
INSERT INTO accountuser (username, password) \
    VALUES ('cyrus', '<whatever you wish>');

You will need to remember these passwords since you will be logging into Xerxes with the admin user and will be putting the cyrus username and password in the configuration files /etc/imapd.conf.