Click on the link to watch the video on: Uploading an Image
Browsing and Uploading Images   
Using iPhoto
Summary: Getting images from iPhoto, using iPhoto to size images
To use photos stored in your (Mac) iPhoto application, follow these steps:

1)  Open iPhoto.  Picture_1.png

2)  If transferring one photo from iPhoto, highlight the photo in the photo library.

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3)  Under File, choose Export.

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4)  Choose JPG or PNG under Format.

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5)  Choose Scale images no larger than: and enter 500 into width (height will self-adjust).

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6)  Choose Export, name image when prompted and choose a location to save the image, and choose OK.

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7)  Your photos are now available in the location in which you saved them.  Continue Uploading and Browsing as described for Mac or PC.