On My Camera it is the same as transferring photos from Camera to PC. i.e Drag 'n' Drop. If you want to copy the files rather than move them, go to My Pics (or where they are stored) and highlight the ones you want to copy. Then go Edit > Copy to File/Folder and navigate to your camera memory card
That should be easy - yes you should be able to. How exactly did you transfer the photos onto the computer? If its just from a flash memory card then just plug it in (assming you did this and have a card reader) and drag and drop the files back on
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