You can configure LotAtc Server within the config.lua file. It is located in your %userprofile%/Saved Games/DCS/mods/services/lotatc/config.lua

tip. Use Notepad++ or Sublime Text to modify this file, DO NOT USE Notepad, it will corrupt the file

    red_password        = "red" ,
    blue_password        = "blue",

Set the passwords used by LotAtc client to connect to the server.

For more details, click here: Server Configuration