1. Open the PDF.
  2. Tap on the thumbnail button (which is on the top left).
  3. The view now changes so the pages of the PDF are arranged as thumbnails and the thumbnail button will be highlighted. 
  4. Tap on the document editor button which is to the left of the now highlighted thumbnail button.
  5. Select the page(s) that you want to rotate.
  6. Tap on the rotate button (the 4th button from the left). This will rotate your page by 90° to the right.
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