How to zoom in using a nikon 3100 camera?

Is rotating the lens on this camera the only way to zoom in while taking a photo? With my cheap sony digital camera there was just a button on top that automatically zoomed in the lens for a close up. What kind of lens should I get for my nikon?

Apparently you need to do some homework sport. First read up on dslr lenses. Then read up in your owner's manual. You have a lot to learn don't you. Get started now.