Now that the servo controller is connected ,you can use some software provided by Pololu to control the servos. This is done just to make sure you have everything hooked up correctly, and to set the controller's setting. Unfortunately, the software won't run on the Raspberry Pi; you'll need to do this using your personal computer. First, download the Pololu Software from www.pololu.com/docs/0J40/3.a and install it according to 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 tab, and you should see this:

Make sure that the USB Chained 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 12 servos. The screen should look like this:

Now you can use the sliders...