One of my keys are sticking in my laptop...?

On all the laptop keyboards I have had, you can just prise it upwards from one of the sides.

It will then pop off.

To replace, just position over the key cradle, lining it up with the rest of the keys in the row, and then press down firmly. It will snap back into place.

Don't worry if the key cradle lies flat after the key has been popped off. It will move back into shape once the key is popped back on.