So what is Bluetooth tethering all about? I thought it was to share your phones Internet?
First off, DONT GET PDANET, it sucks. Second Get MyWi from Cydia or ROCK APP. Best Tethering App available.
BT tethering is just like Wifi tethering or USB tethering but just via the bluetooth in the phone and your computer, establish BT connection from your PC's BT and iPhone BT and boom BT Tethering.
To clear things up since you seem confused. Just because you jailbroke doesn't mean tethering magically shows up. You need to install tweaks or apps for that. Once you install MyWi(my advice) tetheirng is instant from there.
Maybe you should learn more about how to tether and what it is before you just go and do it.
Good luck
EDIT: You seem real confused, you should google the process for sure.