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  • click on your image for the image toolbar to appear (View ▸ Toolbars ▸ Image);
  • click the Rotate icon on the toolbar (a semi-circle arrow). Note that the green handles around the image turn red;
  • move your mouse over one of the red handels around the image (at one of the corners of the image). Note that your mouse turns into a round, two-headed arrow; and
  • once your mouse turned into the arrow, left-click, move your mouse up or down, and release the left-click.