No worries. You aren't lost - things just got put into non-default places. I am not sure where things went wrong...possibly during the data transfer/migration via Wi-Fi.
So, let's see if I have this straight:
1. iPhoto Library in Pictures folder
2. iPhoto Library in home folder > Library (hidden) folder - in screenshot
3. iPhoto Library on external hard drive - is this a manual or Time Machine backup?
-Are there different pictures in all of them, or different amounts of the same pictures?
I am not familiar with the iPhoto Library Manager application. so I cannot help with instructions on how to use it. It also may be a good idea to get someone to help in person, as it is a little difficult to give step-by-step instructions via this forum, due to the nature of the issue. It isn't that bad of an issue, but it would definitely be best to have a backup of both the internal and external hard drives on a third hard drive before proceeding. The last thing we want is for you to lose any of your data.
If I had a full backup and were to work on it, I would rename the iPhoto Library in the screenshot in the hidden Library folder to iPhoto Library 2, then move it to the Pictures folder. I would then unmount/eject and disconnect the external hard drive and use iPhoto Library Manager to merge the two libraries in the Pictures folder, then deal with the one on the external hard drive later.
Does that help?
C