It all depends on how you have set up the USB on the PIC. I don't know what PIC is used on the development kit board, but there are plenty of examples, particularly on the Microchip web site and you can get them when you download the MPLAB software.
If you use the CDC device software, then you can use something like Hyperterminal on the PC as the PIC will appear as a serial port. If you use the HID device software, then you will need to write your own USB user level driver - again there are plenty of examples in the Microchip software downloads including PC driver software.
Susan