This is why if you don't know what you are doing you don't just click buttons.
The 2nd image was a selfcheck screen, that 4th button is send information by mail, obviously it is impossible for you to mail them identification, so in 10 days the account will be deleted anyway, and you can't login for those 10 days, until you confirm your identity.
Oh, and the error is because your username, and nickname are already in use. This all can be avoided if you just stop clicking stuff that you don't understand.