Username:	Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.
First name:	Optional.
Last name:	Optional.
Email:	Required. Inform a valid email address.
Password:	Your password can't be too similar to your other personal information. Your password must contain at least 8 characters. Your password can't be a commonly used password. Your password can't be entirely numeric.
Password confirmation:	Enter the same password as before, for verification.