Yesterday I updated to iOS 5.1 and purchased & downloaded iPhoto for iPhone & iPad . I had never used iPhoto before. I was trying to edit one photo from my iPhone camera roll, I don't remember what I did, the photo was lost. I can see in the iPhoto main page under Edited and Flagged square box, but I couldn't see anything by tab on photo, it showed black. It was not in the camera roll anymore, totally lost. I didn't use iCloud for Photo Stream (off) . It is impossible to go to iCloud Photo Stream. in the end I delete the apps and reinstall again. I dare not touch or test any photo again. Is there anywhere to download the iPhoto start up or instruction manual / documents for how to use iPhoto , I can't find in apple support . Hope to see response from somebody who is familiar with this. Thanks in advance.