Ah, okay. Now I see what's going on...

Anyway what fixed my problem was doing what xJeris pointed out by going to:
1. (http://findmyorder.com).
2. Enter your information. Click on next...
3. You should see serial number.
4. Open another browser or window and go to: (https://secure.square-enix.com/accou...est=mogstation) and login and enter your password.
5. Go to account services and you should see a add windows platform or something like that and click that box and you should come across a page that says code entry. In that, there should be 5 empty spaces.
6. Copy and paste each part from your serial number you got from (findmyorder.com) into those 5 empty spaces.

Hopefully it works out.

Thanks xJeris for that!