You are on the right track.
Before you can connect to the FIS-Control with TeraTerm, you have to set the FIS-Control in the correct mode:
SETTINGS -> FLASH MEMORY -> LOAD STARTLOGO -> BLUETOOTH
Now search for new Bluetooth devices with your laptop and pair the FIS-Control (PIN code is "1234").
Windows will add two serial ports to your system. When you start TeraTerm now, you will be able to select "Serial" and choose one of the ports. Only one of them will work, so you might have to try both.
You can now continue like I described in the second post of this thread.