If you can't log into your account, try resetting your password. You can request a password reset email using this link: https://scratch.mit.edu/accounts/password_reset/.
Make sure that when you try to log in with your new password, you have typed the username exactly as it is written in the password reset email you received.
If you are using a student account (you can check by seeing if your profile says “Student of…”), ask your teacher to help you reset your password.
If you haven't received a password reset email one hour after requesting one, please check your spam folder (if you use Gmail, it may be under your "promotions" tab). If you can't find it there, reach out to us via the Contact Us form (Click the "Back" button until you return to the search bar, and then click "Contact Us" below the popular help articles).