That does not help the OP rotate the sprite in the image editor, which is what this topic appears to be about: "How do I rotate a sprite in the image editor". Those commands will only help them to rotate it in their game, but not in the IDE.
@bennj007 You can use the rotate tool in the tools section of the image editor:
You have to select a part (or all) of the image and then use the rotate tool to rotate it. In the Image menu of the image editor you can also use the rotate clockwise/anticlockwise commands, but I think they only rotate the image 90degrees in either direction.