Ok, this is how you do it:
First select the rotate tool (second row, fourth column), then set the angle (the little black box that says "Angle", above where you resize your brush). Drag it to 90 or -90 or whatever angle you want, then draw a rectangle in the canvas around what you want to rotate, and that should do it!
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First select the rotate tool (second row, fourth column), then set the angle (the little black box that says "Angle", above where you resize your brush). Drag it to 90 or -90 or whatever angle you want, then draw a rectangle in the canvas around what you want to rotate, and that should do it!