Amusing. You don't understand concepts like mounting disks and don't know how to drag the iPhoto Library, yet it's Apple who have created a walkthrough that doesn't work? No chance that it might be a lack of basic knowledge on your part? No?
A disk is said to mount when it becomes available in the Finder so you can drag things to or from it.
And the iPhoto Library is as draggable as any other object in the Finder, so I have no idea what you're referring to there.
Perhaps this is beyond your computer comfort zone and you might need to take a class.