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You can edit your photos by clicking 'Manage' next to the New Photo button (on the toolbar to the right) to take you to the Organize Your Photos page. From this bulk edit page you can select various photos in your collections by checking the box beneath the pictures(s) you want to change. You can change the collection/album you wish to edit by clicking it's name under Personal Galleries.

Once you have selected the photos you want to change click the bar located at the bottom of the page.

'Move to' allows you to move the photo(s) from one album to another. Delete permanently deletes the selected photos. Add Tags makes it easier to add tags to multiple photos at a time. Change Captions will change the captions on each selected photo. You can also change who can view the photos with the Set Permissions options. Regenerate Images will refresh the images if they havent been displayed properly.