The gesture is the same, two fingers on the screen and twist. But unlike the zoom gesture, it has to be done in the layer.
Select the layer of the item you need to rotate, tap the eclipse icon, when that menu comes up, tap the rotate tool. Then you can rotate. Once you get it where you want it, you have to commit to get back to the drawing mode.
Isn't that fun? Instead of one thing, you get to do five!