You can rotate an image at preset or custom angles in Edit mode.
You can save your settings as a preset for future use.
To Rotate an Image at a Custom Angle:
Click Reset to clear your changes and reset to default settings. If you saved your changes, you cannot reset your settings.
Rotate Icons
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                         Horizontal 
                              | 
                    
                         Click on the horizontal icon, and then use the cursor to draw a line on the image that you want to set as the horizontal line.  | 
                
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                         Vertical 
                              | 
                    
                         Click on the vertical icon, and then use the cursor to draw a line on the image that you want to set as the vertical line.  | 
                
You can right-click a slider to reset to the default value.