Oh, this had happened whilst making my account, and when my sister was making hers! If it shows that the username works, then that's all that you really need to know. If you put in a password, and it shows it's loading, most of the time, it's A-OK! You'll know if it's taken when you try to make it, because it will tell you! If your email is doing the loading thing too, it's fine as well! If it says its already in use, when you know it isn't, you'll have to make a new email, alas... And as always, be sure to activate before it closes!