To install kicad-footprints, run the following command in macOS terminal (Applications->Utilities->Terminal)
sudo port install kicad-footprints
To see what files were installed by kicad-footprints, run:
port contents kicad-footprints
To later upgrade kicad-footprints, run:
sudo port selfupdate && sudo port upgrade kicad-footprints
Reporting an issue on MacPorts Trac
The MacPorts Project uses a system called Trac to file tickets to report bugs and enhancement requests.
Though anyone may search Trac for tickets, you must have a GitHub account in order to login to Trac to create tickets.