dbsettings.php is CMS base configuration file. Common configuration you will be able to set up in already installed CMS.
To install and use SiMan CMS you need to edit includes/dbsettings.php file, and setup next parameters:
$hostNameDB - MySQL server name (usually localhost). If your server running MySQL not on default port use hostname:port
$nameDB - MySQL database for SiMan.
$userNameDB - MySQL username with full access to database specified in $nameDB.
$userPasswordDB - password for MySQL user specified in $userNameDB.
$tableprefix - prefix before each database table used in CMS (sm_ by default)
$tableusersprefix - if you are running few instances of SiMan CMS with single user space you can cpecify separated prefix for user tables. Leave it empty for default settings (the same as $tableprefix).
$session_prefix - security prefix for user sessions. We are strongly recommend to change it.