The folder that contains all the saved configuration files will be located at EACS\config-files.
Let's say you have this configuration for Equalizer APO:
Channel: all
Preamp: -2.5 dB
Filter 1: ON LS Fc 500 Hz Gain 5 dB
And you want to call the configuration My Config.
Create a file in config-files names My Config.txt, copy the configuration text and paste it into My Config.txt, and then restart EACS.
You will see your new configuration appear in the list as "My Config".
Simply find the .txt in the configuration folder of the config you want to edit, open the file and edit the text how you want.
Once you save the file, the changes should be immediately applied, whether the config is active or not.
To remove a config all you have to do is delete the .txt file associated with that configuration.
Restart EACS and you will see the configuration does not appear in the list anymore.