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