Answer by
blenderb421 (14)
From the Edit Menu, choose "Image Rotation>Arbitrary." Enter the angle that you want to tilt (rotate) your image, and choose either "CW" (clockwise) or "CCW" (counterclockwise). Click OK to confirm you selection. Presets of 90 degrees (CW and CCW) and 180 degrees are also offered on the Image Rotation entry on the Edit Menu for easy access.