Requet to enable the bluetooth usb dongle support

i will ask you again , if the banana pi m3 has bluetooth on board , one , do I need a bluetooth dongle ??? I am running ubuntu mate . why is it not working . the bluetooth dongle is 4.0 . so tell me how to set it up please. also my banana pi m3 does not play youtube . click on the start and just sit there. the board is also hot . I would like some one to help or I put it in the bin , as I also asked about cleaning up the emmc as not the board is slow .
thank you , Marc