It sounds like you should have your program write out a text .INI file with the various key value entries in it.
The user can then use any text editor (such as Notepad) to edit the .INI file.
When your program starts up, it can read the .INI file as a text file and check all the entries to see if they are acceptable.
Look up a manual of text book to find out how to open, write to, read from and close text files. Check out any code examples. This should give you a good start for your program.