biasi:
the rpi p2 has not Bluetooth interface so the dongle should be installed on RPI;have you bought the dongle for your pc or for raspberry? if your pc has a Bluetooth interface check if the menu "personal area network" is present when you click on Bluetooth icon with right mouse button
yes the LSSEDA I bought is for a custom PC I built for video editing which lacks bluetooth. I am using another bluetooth adapter with the RPi 2 that I already had and I have already confirmed it works with the RPi 2.