Function:
Crop the photo in a circular shape with your fingers.

Instructions:
1. Click "Trim Photo" in the menu
2. Click the "Select Image" button (read / write permission may be required)
3. Choose a photo to crop in a circular shape.
4. Click the "Cut the photo" button
5a. Use one finger to move the circular region in preview.
5b. Use two fingers to stretch the circle to different sizes in the preview.
6. Click on "Save Image" and wait for processing and completion.
7. When finished, you can find a circular photo in the gallery.