Yes, this needed it's own thread. It is a little confusing, so here it is step by step:
When you log onto the site, there is a link you have to click.
1) log onto the site.
2) it asks you to log again ... so do it.
3) now you are on the site, and it asks you to log in again. DON'T!
4) DON'T log in again
5) on that page, is a link that says "Final Fantasy XIV beta test site".
6) Click it!
Yes, i copied this from a post i made earlier. :)