[zachrobo1]

Are you using an Arduino to control this or a Vex PIC? It wasn't exactly clear.

Either way, this is pretty simple to do. On the Victor's PWM cable, your ground (black) cable will need to go into the Arduino's ground pin (on the PIC, it will be the outermost pin in the motor breakout). Then, the signal cable (white) will need to go into a PWM-supported pin on the Arduino (on the PIC, the innermost pin). You shouldn't need to do anything with the red +5V pin in the center.

Programming wise, in RobotC it should be the same as programming the 393 motors (-127 to 127) while if you are programming it on Arduino you would need to call analogwrite with a value from 0-255.