1. Open one PDF file and tap “Page Edit" ( ) on the bottom of the screen.
2. Then you will see page thumbnails of the PDF document you are currently reading.
3. Tap "Edit" () at the top-right corner of the screen, and you will see a menu bar appeared on the top of the screen.
4. You will see various editing options, including "Email out", "Rotate", "Add", "Extract", "Delete", and "Select All".
5. Select the page(s) and then tap one button you would like to use from the top menu bar.