When you are reading a book, tap the top of the screen which will bring up the tool bar tap the sunshine symbol which will bring up a brightness box , slide the circle to the level required. (The upper toolbar is visible when you are on the home screen)
(If you need to alter the font size etc look at the tool bar at the bottom of the screen)
To return to your book, close the brightness box and tap the middle of the screen
Hope that helps
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