As far as I know, it's not the PHOTOfunSTUDIO that does the renaming, but your recording device. You have to access its built-in settings to tweak it and assign what you want to the file name. You can check in the PHOTOfunSTUDIO as well, but I doubt that it will be available.
Also, check the manual for both (device and software) because I can't install PHOTOfunSTUDIO since it's proprietary and found only on the CDs that came with your device.
Alternatively, use a file renamer to have the files just how you want it.