You can rotate images using the Properties toolbar located on the right side of the editor. Follow the preceding steps to do so:
1. Select the image you wish to rotate.
2. Enter a rotation angle, in degrees, in the Rotation angle box or use the arrows to adjust the rotation.
Tip: Enter a negative angle to rotate the object clockwise; enter a positive angle to rotate the object counterclockwise
Once you are done, don't forget to save changes.