I found last night you can! You can turn the pages with the little joystick. I remember specifically accidentally hitting it to the left and the page going back one. Of course this was about 2:00am as I was trying to finish a book, so it might be my crazy sleep-deprived imagination.
Besides that, I have sometimes found myself holding the bottom with my right hand, with the thumb on the front and my fingers on the back. I can change the pages with the bottom left circle this way. It's not as comfortable as the left hand/side buttons, but it's good for changing positions.
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