How do you unlock a gateway laptop mouse pad

There is a Fn+F(number) key combination to lock and unlock a touchpad. My Lenovo uses Fn+F8. I see a symbol of a rectangle with diagonal slash in different color on the key. My friend's 10 year old Gateway has a F9 key with "Pad Lock" in blue on it, to be used with the blue Fn key. My Acer has a blue Fn+F7 key with a finger touching a rectangle in blue on it. Your keyboard might be marked in similar fashion, or see instructions from Gateway. Or pad might be disabled in the BIOS setting or on the Device Manager of Windows.