I cannot type on my keyboard dock without touching the mouse and messing up what I'm trying to type. When I google how to disable the touchpad, it tells me there is a button in the top left of the keyboard dock that should be above the 3 that disables the touchpad, but none of the buttons I press on my dock work and I don't have a button that has an icon that looks like a square. I have a RCA Viking Pro. Can anyone tell me how to disable the touchpad? Thank you.