Go to https://socrative.com/ and click on Login to sign as a teacher. Click on Reset Password:
Enter your Socrative account email address and click Submit.
You will be sent an email containing a temporary, single-use URL to reset your password. Type a new password and type it again to confirm, then click Submit.
After resetting your password, you'll be taken back to the login page. Use your Socrative email and new password to login!