What keyboard are you talking about - the laptop's own keyboard or an external USB one ?
I cannot speak for the IdeaPad 330 but my wife has a 310 and they are probably not much different. On her's it is the F6 key to turn the trackpad on or off. On most laptops I have run into before this one it would the Fn key plus Fx, where x was a number chosen by the manufacturer. Lenovo seem to have accepted that this range of laptops are not going to be used primarily by gamers so they have reversed the priorities on the function keys.
If you now want one of the classic function keys - F5 perhaps, to raise the flaps on your Boeing 737 - it takes 'Fn+F5'. This really speeds up gaming !