If you don't recall your database name then you may want to start with looking at includes/config.inc.php.
The top few lines will tell you all the info needed.
<?php
$config = array (
'DATABASE_SERVER' => 'yourhost',
'DATABASE_USER' => 'username',
'DATABASE_PASSWORD' => 'password',
'DATABASE_NAME' => 'databasename',
'TABLE_PREFIX' => 'ubbt_',( this is the default setting)