How do you turn on the showerhead for a 1700 Delta showerhead system?

I just moved into a new place and it has this shower system installed. I feel silly for asking this, but where is the damn button that I press to make the water come out of the showerhead and not the faucet? I tried pushing it. I tried pulling it. I tried twisting in ways that if I were a shower system, i'd... show more I just moved into a new place and it has this shower system installed. I feel silly for asking this, but where is the damn button that I press to make the water come out of the showerhead and not the faucet? I tried pushing it. I tried pulling it. I tried twisting in ways that if I were a shower system, i'd feel molested--but no. So to everyone out there, what are the magic words that I must utter for it to open sesame? Thanks!
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