You can log in or register using the "Passwordless Login/Registration": Enter your email address and click on "Get your verification code". Then open your email to receive the message with the 6-digit confirmation code, and enter this code in the "Verification Code" field to complete the registration or login. If you have forgotten your password, this is an excellent way to log in nonetheless.
Afterwards, you can create a password in the "Account Management" section.