Name and surname are optional, only administrator sees them in your registration
Your valid email is required, but it is invisible for everyone - administrator sees it only anonymized.You can log in using email address (instead of login name).
(+4219YYXXXXXX)Your phone number is required, but it is invisible for everyone - administrator sees it only anonymized.
Login name is optional, it is possible to log in using email address.
Password must contain uppercase and lowercase letter and number.