Data to connect to the database in Bitrix are specified in the configuration file bitrix/php_interface/dbconn.php
in lines:
$DBHost = "host"; $DBLogin = "login"; $DBPassword = "password"; $DBName = "base_data ";
And also in the file bitrix/.settings.php
in lines:
'host' => 'host', 'database' => 'base_data', 'login' => 'login', 'password' => 'password',
Changes can be made using file manager or any FTP client.