Hi fellow Rachel :)
I don't know where to find that button either, however my power button also fell off, and I found an easy fix - luckily the little metal presser part is still in tact in my situation (hopefully yours too) so I just bought a cheap phone case (the kind that has little plastic buttons on the side rather the kind with holes where the buttons are). The case's button essentially replaced the phone's; Since then, I honestly forgot that I was missing anything, it works perfectly fine!
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