How to Find Path of ConfigFile [Network Server]

Hello all,
I’ve had a problem where I can not change the ConfigFile of the network server as I have tried to use:

sudo nano
and found many network config files. I thought I had set one of them to the US915 however it was not changing what I saw using:

chirpstack-network-server configfile

My main question is: How to find the path of configfile? As well as, how to change the path?

Thank you for any and all help!