Your password should contain more than 8 characters; both uppercase and lowercase letters and numbers. Your password has to be at least 8 characters long.
If you want to you can add a recovery e-mail to your account. It can be changed later. If you do not add one, your pasword cannot be recovered.
Warning: Please do not use disposable or throwaway email accounts as a recovery email for your account. While it is acceptable to omit a recovery email, using disposable accounts poses a security risk. These types of services are often public and allow anyone to use the same addresses and potentially view the emails of other users. This means that someone could potentially reset the password to your account without your knowledge.