Push latches downward.
As picture 3 shows below, you could find some latches on the laptop keyboard, total 4 latches, beside the key F1, F4, F8 and F12, use a little flat screwdriver to slide down gently.

And as picture 4 shows below, lift the keyboard from the motherboard, once the keyboard is moved and the flat connection cable between the keyboard and motherboard exposes. And before you pull the flat connection cable out of interface, first unlock the connection cable-lock.