Under "Your account" tab in your friend's account page, given he was still in TRIAL PERIOD, there is a small tab "Enter Recruit friend's code". Entering the code that your friend received in his recruit email,you will receive another confirmation email to notify you about the process was done. Then as soon as you friend sub, you should have the appropriate rewards right away.

Note: The code HAS TO ENTER BEFORE he subscribe ( before trial period time out) for it to work. If he has forgotten to enter the code upon officially subscribing to the game ( either by game time card or other methods) the code won't work.