OK that seems intuitive now. One more question:
This Makeblock board http://www.makeblock.com/me-orion-base-on-arduino-uno/ is fairly useless but they are able to connect the motor directly to the Uno.
How are they doing so without a stripboard? I looked at their source code on github and those 9 and 10 pins (orange ports in image) do the same thing as a digital and analogWrite. That orange piece is soldered onto the board (I have it in-front of me).