PiPO Pad-P1 - Manual (Page 23)

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Tap the “e-book” icon to open e-book shelves. Tap an e-book to
open the book and read.
You can page up or page down by sliding your finger right or left.
Tap or the menu button to check the sub-menus. You can set the
font size, Go to Page jump; check your bookmarks, set the auto flip
time, etc.
6.6 Sign function
Tap the “sign” icon to open this.