Can I change photo from Private to Public and Vice Versa

Yes! All you need to do is go to your "Profile" view and select the photo that you'd like to switch. Once you've selected the photo, tap the "..." button and tap the "Make Private" button. The photo will then become a private photo.

Remember, you can also make a photo private during the creation process by tapping the "..." button on the print preview screen and selecting the "Private" option.