Help in controlling to turn??!!

[Your Computer]

The mouse has always been used to rotate the camera. In your case the mouse is your touch pad. If you want to use the keyboard as your mouse, you're going to need some kind of mouse emulator.

thanks so much for the answer! May i ask what an emulator is?

An Emulator is a device that can be used to make a game that run on a certain platform, to be played at another completely different platform (EXAMPLE: Wii Emulator used by me to play Ju-on: The Grudge on my PC)

That's a type of emulator, but that's not what an emulator is. An emulator is a software application that imitates hardware.