A clicker emits a consistent click that precisely marks the instant of correct behavior, bridging the timing gap between praise and treat delivery.
Step one is charging: click then immediately treat, repeated until the sound predicts reward, with no behavior required yet.
Then capture naturally occurring target behaviors or lure movements, always following each click with a reward to keep the one-click-one-treat contract.
Short daily sessions in a quiet setting suit cats; if the click startles your cat, substitute a pen click or a verbal marker word.