The bot does a great job of storing all of the information it needs. If the Director passes it your username and server, it can automatically remember the rest of the information and fill it in on the login screen. This is a great security boost, not having all of your passwords stored in the config file.
If you really want to put your password somewhere, though, there is a User Notes field that can be used for anything you want. Some people put their alliance name or password or account type (main, feeder, etc) in there.