The multi-pin, multi-purpose capability of the Broadcom processor allows you to switch PWM0_OUT to GPIO 18 and PWM1_OUT to GPIO 13 or 19. Add the network from the Adafruit note, or check this ...

As you can see in the image, it serves up a webpage (using the Apache2 server) which allows you to change the state of the GPIO pins ... we loved about the Adafruit Web IDE.