I saw the developers notes saying to access the config file it is at /etc/auto-cpufreq.config. I'm not even sure how to find that directory using the typical "start menu" button on bottom left of desktop.
It should be that once you open Xed, open the config file like any other text file within a text editor.(irrespective of operating system)
File — > open.
Maybe the file doesn’t exist yet in the /etc directory. Did you install it so that it automatically runs at boot? The config file creation might be a part of that process.
https://freerepublic.com/focus/f-chat/4004414/posts?page=7#7
You could think of this similarly to an antivirus program on Windows. The core program is installed, but the secondary component that runs on its own daily may not be actively installed. It’s only going to scan when you tell it to.