How to zoom in is easy use the video below to find out how to activate it. Zoom was automatically turned on in Snow Leopard but Apple turned it off when they released Lion. To turn it back on go to system preferences (go to finder then it is in the application folder), then accessibility, then to zoom, then check the box next to "Use scroll gesture with modifier keys to zoom" the default key is control. Then, to zoom in, press and hold the control key on your key board and use two fingers on your track pad and push up without clicking (like when you are scrolling down a page). To zoom out hold down the control key and slide two fingers down on your track pad.