1. Select a photo .
2. Tap “spherical” icon to switch to “little planet” mode.
3. Drag image to adjust it.
4. Tap ”share” icon.
5. Tap ”share screenshot” button.
6. Chose a ratio selection to crop the image.
7. Tap “ok” button.
8. Select an action, for example: Facebook or others to share the image.
(2017-11-14)
Or watch tutoral video https://youtu.be/GdrorQl8COg