Now that the hardware is connected, you can use some software provided by Polulu to control the servos. Let's do this by using your personal computer. First, download the Polulu software from www.pololu.com/docs/0J40/3.a and install it based on the instructions on the website. Once it is installed, run the software and you should see this screen:

You will first need to change the configuration on Serial Settings, so select the Serial Settings tabs and you should see this:

Make sure that the USB Chained option is selected, this will allow you to connect and control the motor controller over USB. Now go back to the main screen by selecting the Status tab and now you can actually turn on the twelve servos. The screen should look like this:

Now you can use the sliders to actually control the servos. Make sure that the servo 0 moves the right front lower servo, 1 the right front middle servo, 2 the right front upper servo, and so on. You can also use this to center the servos. Set all the servos so that the slider is in the middle. Now, unscrew the servo horn on each servo until the servos are centered at this location. At the zero location of all servos, your quadruped should look like this: