I Believe the switch is On/Off. There are caps for the diaphragm that should have come with it, that change the polar patterns. you'll have to look in the book for which one is which.
That's correct. The switch is on/off. A small "cap" should have came with the mic. You unscrew the top part of the mic off and expose the capsule. The cap just snugs down over the capsule and changed the mic from cardiod to hyper cardiod (narrowing its capture area).