The configuration file is called d-rats.config and is located in a different place, depending on your operating system.

On Windows you can locate the configuration file by doing the following:

• Go to Start -> Run
• Type %APPDATA%\D-RATS and hit OK
• In the resulting window, you'll see the d-rats.config file

On Linux or MacOS the file is in your home directory, in the .d-rats subdirectory