Thats whats fun about the clicker, once your dog understands that a click means their favourite reward, you can click when they do something you want to capture. The dog soon catches on. I enjoy watching them try all sorts of things to get that click and treat. It switches them into operant or think mode.
You can use your voice too but a clicker is more precise at marking the event and my dogs seem to love it. I do fade the clicker eventually.
Does your dog like to play? this can also help build your relationship and dogs willingness to try new things.