The first order of operations is to make sure your keyboard is powered down (if it's wireless), or unplugged if it's a wired keyboard. Once you power down your keyboard, you can begin to remove the keycaps. You can do this by pinching the sides of the keycaps and pulling upwards, or by using a keycap puller. If you have a keycap puller, which I recommend using instead of your fingers, you just place the puller over the keys, and pull upwards, removing the keycap.