3.In file list menu, tap file extension name pdf file.
＊It appears the current page and totall pages on the bottom of screen.
＊Tap 
to select the best reading ratio, provides 10 types of ratio including 400%, 200%, 150%, 125%,100%, 50%, 25%, 12.5%, fit page( fit the size of screen), fit width （fit the width of screen）.
＊Tap 
to turn previous/next page,
＊Tap 
to turn previous/next ten pages.
＊Tap 
to memorize previous action.
＊Tap right and bottom scrolling bar to view up and down.
＊Tap 
to return to previous screen.
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