that site, is the community site for NA, you would need to register a new account first, and try to use the same email u used for your SQEX account. I know, you must be thinking SQEX is so damn confusing. IT IS Frustrating! There's so many sites! First you have Lodestone, then your Account Management site, then this NA community site and they are all NOT directly related! man... It's been like this since 2003 FFXI days.. 10yrs in, and it's still the same stupid system. With FFXI it's even worst back then since you would have to use POL (Play Online) <- another system. Sorry I really had to let out steam, been really annoyed trying to get NA pre order but finally gamble by ordering EU version with GMG. All NA online pre order with SQEX online store, ur credit card needs US mailing addresses, despite you fill in a different form while entering credit card details. The address need to match .. I didn't try amazon with entering fake address because my mind is too exhausted already after few hours trying any means I was able to find.

I've really went and read that 111pages of the sticky with pre order info in beta forum..
The problem is that we can't try the pre order code yet until it sends us the detail to use it on a later date before early access starts.
Some say the pre order code is region free, any SQEX account can use (this was answered by a rep to a player in email).
then some say "Item code MAY NOT BE" region free (this was answered by a rep to a player in email).
and lastly some say it's region lock!(same thing, answered by a rep to a player in email)
man... same question directly to SQEX support, and all 3 guys getting different answers. I've also send in the ticket and hope will get a definite answer. I'm dying here. I really don't know why I want all these fuss just for having early access.