Download the following bit file to your computer (in a known, accessible location): amc13T2v0x17.bit.
Connect your JTAG cable to the bottom-most of the two 10-pin, rectangular, male sockets on the front panel of your AMC13. Note that "pin 1" is in the upper left-hand corner of the connector
Once your JTAG cable is connected, open the IMPACT software (see iMPACT Installation for installation instructions and Running iMPACT for startup instructions) on the computer which is connected to your JTAG cable
The software will prompt you about loading past projects and creating new ones. Just say no/cancel to all of these opions.