Quoted from dmacy:Should just pull the white part from the black part. It is usually a tight fit and take a grunt or two. If it is a newer switch, which this doesn't look like, it would be turn the white part to the right (I think) if you're facing the start button.
Some of them turn a bit, then pull out, some simply snap straight in.
The snap-in types take a bit of force, it does feel like it's going to break, but it's OK.
RM