Your user name may contain ONLY digits, upper case and lower case letters and underscores. ie,
Use underscore between first name, second name and third name (No spaces).
Email must have a valid email format and should not exceed 50 characters.
This email CAN NOT be changed whatsoever and can be used to change passwords, need be.
Passwords must be at least 6 characters long.
Passwords must contain :
At least one upper case letter (A...Z)
At least one lower case letter (a...z)
At least one number (0...9)
Your password and confirmation must match exactly.