If you'd like to make changes to a photo album you created, first go to the album you'd like to edit. You can locate it by going to the "My Content" tab and clicking "view." Then click the blue edit button below the last photo in the album and select "Edit Entry" from the drop-down menu.
From the edit screen, you'll have the ability to caption, rotate, and rearrange your photos. You'll also be able to add, remove, and change photos in your album. Remember to save your changes when you're done!