Arduino robot serial communication

hi there,

i have just received an arduino robot and i am wondering how to connect a serial bluetooth module. the tx/rx pins are occupied for communication with the motor board, so i thought to use softwareserial instead, but it is not clear how to do that using the arduino robot library or using directly the exposed pins.

does anyone have any idea of how to use the pins on the control board for rx/tx?

thanks in advance