How to get Doxygen Working
Doxygen Manual: Doxygen usage
Doxygen is a command line based utility. Calling doxygen with the --help option at the command line will give you a brief description of the usage of the program. All options consist of a leading character -, followed by one character and one or more arguments depending on the option.
https://www.doxygen.nl/manual/doxygen_usage.html
Doxygen Manual: Doxywizard usage
Doxywizard is a GUI front-end for configuring and running doxygen. When starting doxywizard one can specify an existing configuration file to use as argument, otherwise the default settings will be used as a starting point. When you start doxywizard it will display the main window (the actual look depends on the platform used).
https://www.doxygen.nl/manual/doxywizard_usage.html

This is a link to all commands: https://www.doxygen.nl/manual/config.html