On the NA version of the site the signup is right there and really obvious.
But I remember the instructions saying EU players HAD to use the EU SE Account to have their tokens/etc working properly, but there doesn;t seem to be jack-***on the European site. Has anyone been successful, or has any input on this issue? :3 Cheers~
http://www.square-enix.com/eu/en/index_f2.html