dbhost: SQL Database Hostname
dbuname: SQL Username
dbpass: SQL Password
dbname: SQL Database Name
$prefix: Your Database table's prefix
$user_prefix: Your Users' Database table's prefix (To share it)
$dbtype: Your Database Server type. Supported servers are: MySQL, mysql4, postgres, mssql, oracle, msaccess, db2 and mssql-odbc Be sure to write it exactly as above, case SeNsItIvE!
$sitekey: Security Key. CHANGE it to whatever you want, as long as you want. Just don't use quotes.
$gfx_chk: Set the graphic security code on every login screen,
/* You need to have GD extension installed:
/* 0: No check
/* 1: Administrators login only
/* 2: Users login only
/* 3: New users registration only
/* 4: Both, users login and new users registration only
/* 5: Administrators and users login only
/* 6: Administrators and new users registration only
/* 7: Everywhere on all login options (Admins and Users)
/* NOTE: If you aren't sure set this value to 0
$subscription_url : If you manage subscriptions on your site, you must write here the url of the subscription information/renewal page. This will send by email if set.