Welcome Spike's owner and here you go. White switch is just above the spring in the middle of the picture.This is the one on the clutch pedal, which if you have a manual is usually the culprit, but there is one on the brake pedal as well. I've also seen them come in black.
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You can't really see it and get your hand on it at the same time so have a look first and then do it by feel.
It just needs pushing down from the top.