If you have photos saved on your computer’s hard disk (if, for example, you scanned photos or downloaded photos from an email), you can import them into iPhoto. You can also import photos from any computer you have access to on a network.
To import photos from a hard disk:
Do one of the following:
Drag one or more photos or a folder of photos from the Finder to the iPhoto main window.
Drag one or more photos or a folder of photos from the Finder to the iPhoto icon in the dock.
In iPhoto, choose File > “Import to Library.” Then select the photos you want to import and click Import.