How to Configure db-config

The install instructions here aren't the best:

1) Place the files in the specified directories
2) Configure db-config.php

Is there any place that explains exactly how to configure db-config.php?

I'm needing to install this asap. I'm gonna use version 2.9.2 (still haven't upgraded to 3.0).

And, does the file actually need configuring? or will it work as-is?

Or is "configuring" it really mean just adding in any changes from wp-config?