Go to suzyai.net/login and enter the email and password from your welcome email.
Forgot your password? Click "Trouble logging in? Get a one-time code" on the login page. Enter your email, choose to receive the code by text or email, then enter the 6-digit code when it arrives. You can optionally set a permanent password once you're in.
Your login session lasts 24 hours, then you'll need to log in again.