The wires are coming from the 2 solderings just above the atmega/usb switch on the shield, from the RX and TX for bee2
I can't see the picture again. There need to be 4 wires - two for the bluetooth device and two for the XBee. The 2 from the blue tooth device go to TXn/RXn, and the two from the XBee go to TXm/RXm. Use Serialn to talk to the bluetooth, and Serialm to talk to the XBee.