Thank you ac4It.
To move around the page with the stylus works very well, but I understand that it consumes more energy, doesn't it. For the without-stylus method, I still found the problem. Imagine that I want to read a page by quarter, I drew box on top left part of the page. Once I hit 'next', it turned to the bottom left part, still what I wanted. However, when I hit 'next' again, it skipped the right part of the page and turned to a new page.
Anyway, I know that I can use stylus to do so. Thank you again.
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