Check your spam folder - several of my friends say their code has been in the Spam folder. Alternatively, do this!
Go to
www.findmyorder.com
Input the email address and the last 5 of the credit card you used to order on the right hand side.
That will give you your registration information! The serial number is the 20 digit - #### #### #### #### ####
To add to your account, visit
https://secure.square-enix.com/
Log in with your details.
On the right, select MOG STATION.
Click Account Services.
Then select EITHER "Add Windows Service" or "Add Playstation 3 Service"
Input the 20 digit serial number and click next. It will ask you to confirm the service account to receive the free 30 days.
That's it!
If you would like to upgrade to the Digital CE, there will be a link available.
YOUR 30 FREE DAYS WILL BE ADDED ONTO THE TIME REMAINING FOR THE EARLY ACCESS.