Does anyone know how to turn the touch pad off on my HP laptop that runs Windows 8?

The darn search only brings up the key touch settings for the keyboard. I bought the laptop half a year ago and the cursor keeps jumping around when I type. It happens when I rest my hand on the lower left as I type. Thanks, JIM
Update: It's model @ 15-1777dx. There is no on off key or light for the touchpad on the keyboard.
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