What is touch pad onmy acer aspire 5532, and how can I turn it on/ use it?

I just so happen to have the same computer, look at the top where the on and off switch is at, on the left side is the on and off button for the touch pad. You should see a orange light on when the touch pad is disabled. It's the button with a drawing of a hand on a square. If the orange light is off then the touch pad is enabled, now you have a different problem.
Now go to Device Manger (via start,control panel, Systems & Security -- should see Device Manager in blue), go to Mice & other pointing device, right click on the Alps info, then click on update device driver. If Windows doesn't automatically update, then you have to go to Acer's webpage, then support, then drivers and downloads, fill in the info on your computer to be directed to the proper driver, then download the driver file for Alps mouse/touchpad. This should help (I hope), good luck.