Here are an elaborate explanation of the features.
Zoom: Use it to enlarge or narrow the image.
Rotate: Use it to turn the image around for -90, -180, 90, or 180 degree.
Flip: Use it to mirror the image vertically or horizontally.
Alignment: Use it to edit the image position, for example, to make the image center vertically or horizontally, or align it left, right, top, or bottom.
Layer: Use it to adjust the gradation of images when employing>adding more than one picture. Choose the image and you can put it on the top or bottom.
Copy: Use it to duplicate the chosen image.
Reset: Use it to cancel the last adjustment.
Delete: Use it to remove the image.