When you see the blip page you notice both pages at the same time without moving your eyse up and down.
Ideally you look at about the center crease of the book. It is okay to look over the top if that's how you got the blip page. In time you'll move down to the center of the book to keep the bottom in view.
It's a steady gaze so you don't need to move your eyes up and down over the pages but do remember to blink.
Alex