Where Can I Find DB-Config?

Good-morning!

I have been looking for this DB-Config.php for the past couple of days but unable to see it.

We are using both Domain Mapping and Multi-Domain and want to install Anti-Splog.

The usage instruction says:

If you are using Multi-DB:

You need to add the global table lines to db-config.php BEFORE installing Anti-Splog plugin or running the sql.txt
Add this line to your db-config.php if using multi-db:

add_global_table('ust');

Please how do we go about this taking into configuration that we deleted the sunrise.php that came with Domain Mapping before we installed Multi-Domain?

Thank You!

TK