Try logging through main final fantasy website which should be http://na.finalfantasyxiv.com/lodestone/. Once you're there click on "Home" on the top right and click "Account Management" in the tabs from the "Home" bar Then on that page go to where it says "Square Enix Account Settings" and cilck "Square Enix Acccount Management System", you'll be asked to login with your username and password, and your security token if you have one. Then when you're finally logged in, look for "Service and Options" and select service then choose "Final Fantasy XIV". I think that's where you're supposed to enter your code. I'm a 1.0 player so I don't know much, but it looks like you can enter your code there in the icon called "Add Platform". Hope this helped!