Question about Recruit a Friend Campaign

[h0tNstilettos]

So I just got a friend to join FFXIV jumping from WoW and they registered their account and are now playing on same server, just started today, so I went to do the recruit a friend thing and it says they have to register after following link in email, but what if they already registered? I'm just wanting to find out before I send the recruit a friend link to their email. Also, they are still on the trial, but said they are going to buy the game because they already like it better than WoW in its current state, though I don't see how that's possible to know this early in game, but their words, not mine, but the recruit a friend thing sounds great to both of us.