Cropping with Photoshop

Bring the image into the editor either from the Organizer or with File > Open.  Select the crop tool icon from the tool palette on the left.  Click one corner of the area you want to remain after cropping and pull out the box to cover the desired area.  The image outside the selected area is darkened.  If you like the selection, release the button on the mouse and click on the green checkmark in the lower light of the selected area. If you want to start over, click the red icon.

Cropping Tool

Save the image after cropping.  Often it is best to use a new name so the organizer will also show the uncropped original. That way you won't forget that the original was larger.