Hook the switch puller to the top and bottom of the switch (indicated by the red squares).

Pull the switch straight upwards.

The switch should be pulled straight up and free easily. If not, check whether the keyboard is actually hot-swappable or not.

Once removed, check whether it is a 3-pin or 5-pin switch.

For the RK-71, I will be using the Blue 3-pin Switch. However, if you would wish to chose another color switch, you should find the 3-pin version of that switch.