To install go-md2man, run the following command in macOS terminal (Applications->Utilities->Terminal)
sudo port install go-md2man
To see what files were installed by go-md2man, run:
port contents go-md2man
To later upgrade go-md2man, run:
sudo port selfupdate && sudo port upgrade go-md2man
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.