phpMyChat is a PHP chat room script that uses a mySQL database to store information. Refer to the phpMyChat home page for more information about this script. There are forums here that have many questions and answers in them about this software Click here
To install phpMyChat:
Click on the on the phpMyChat Room link in the Tools area.
Enter the directory in which to install phpMyChat in the available field. This must be a top-level directory on your site.
Enter the administrator's user name and password in the Admin Username and Admin Password fields.
Click on the button.
Click on the entry page link to go to the new chat room.