You can download and use a utility called WaterRoof to change the built in port filtering firewall (called IPFW.) WaterRoof is a GUI so you won't have to use the terminal. You could just block the port used by the app in question.
You can download and use a utility called WaterRoof to change the built in port filtering firewall (called IPFW.) WaterRoof is a GUI so you won't have to use the terminal. You could just block the port used by the app in question.