You can thank Microsoft for hiding things.

They instruct us to use the "Charm Bar" for settings. On a Pad you need to swipe from the very right hand side of the screen to the Left to make the Charm Bar fly out. On a desktop, I've found that if you hover over the little "-" (minus) on the bottom right corner, the Charm Bar will also fly out.
Next choose Settings -> Setup and navigate to what you need.