1. Username field should not contain spaces or special characters. It can be your email address.
2. Password field must be atleast 7 characters long. It must contain at least 1 number, 1 uppercase letter, 1 lowercase letter, and 1 special character.
Good Password example: p@ssw0rd - (In this word, the '@' is a special character, and '0' is the number Zero)
3. Special Characters examples ! @ # $ % ^ ( and )