Hey I have a Futaba T4VF skysport 4-Channel FM Radio and I am wondering where I can get a cord for it so I can plug it into the computer and play realflight g3 demo?

You don't need a radio for the demo. You use the keyboard

Well I have a radio and I need to learn to fly I just now bought a cable.

Well then................Uh..............I don't really know. What i do know is that if you use that on the REAL G3 then it will work