1. Put your G460 laptop upside down.
2. Unscrew and remove the back cover.
3. Look for the keyboard symbol on any screw at the back. There are 3 keyboard screw to be remove in Lenovo G460 Laptop. You must have unscrewed all 3.
4. Put your G460 laptop upside.
5. Above the "F4" and "F12" keys, there should be something to pushed down to unlock the keyboard.
6. Slowly remove the keyboard from up down.
I'll just post the screen shots later.