I don't know where to go to sign up for this. The first page of this topic with all the links included are no help, because when I click on the link for English-speaking countries, i am met with this:

The region associated with your Square Enix account does not match the region of the site you’re attempting to access. Please register from the website that matches the region of your Square Enix account.

I tried all the links just in case and they all have errors.