You now need to create the DB where ACH is going to live.

MySQL:
    mysqladmin -u dba_user -p create ach
    mysql -u dba_user -p
    GRANT ALL PRIVILEGES ON ach.* TO ach@localhost IDENTIFIED BY 'passwd';
    mysql -u ach -p passwd ach < %%WWWDIR%%/db.sql

In %%WWWDIR%%/code/common_db.php, add your database connection
details:

    $dbhost = '127.0.0.1';
    $dbusername = 'ach';
    $dbuserpassword = 'passwd';
    $default_dbname = 'ach';

At the top of %%WWWDIR%%/parts/includes.php, edit the following
lines to reflect your environment, replacing SITEURL with your own domain
and application URL. Do not include a trailing slash (eg. domain.com
instead of domain.com/) in the PHP base_URL variable.

    <base href="http://SITEURL/">
    <?php $base_URL="http://SITEURL";
    $email_domain="SITEURL"?>

You also need to add appropriate configuration directives to your webserver.
A typical configuration might read:

    Alias /ach "%%WWWDIR%%"
    <Directory "%%WWWDIR%%">
        Options Indexes FollowSymlinks
        AllowOverride All
        Order allow,deny
        Allow from all
    </Directory>

Finally, change the RewriteBase URL in %%WWWDIR%%/.htaccess so it
matches the URL in the Alias directive above, e.g.:

    RewriteBase /ach