The ability to crop and edit images is available after image import. The crop/edit options are available within the View Fulls-Size/Launch Editor button.
From there you will have the ability to make the following edits:
- Crop / Crop to a 3:4 ratio / Crop to a 4:3 ratio
You will have the option to apply your edits, revert to the original image, and save the image once your masterpiece is complete.