Hello and welcome to FFXIV! To use my recruitment code please make sure you enter the code BEFORE purchasing your 1st subscription, you will not be able to do so after!
How to redeem the code:
Login to your FFXIV account at "Mog Station" -> http://sqex.to/Msp
Click on "Your Account" at the top left of the screen
Click on "Manage Service Options"
Click on “Enter Recruitment Code” (around the middle of the page)
Enter the code:
G9K7UXRF