Touch
Zoom in and out
Touch the screen or an item with two or more fingers, and then move your fingers toward each other (pinch) or away from each other (stretch). This will bring items on the screen closer or zoom out so you can see more.
Mouse
Zoom in and out
On Start, click the zoom icon

in the lower-right corner of your screen, or press Ctrl while you rotate the wheel button on your mouse.
Next: 2. Use the charms—Search, Share, Start, Devices, and Settings