If you've forgotten your Crosswords account's password, you can reset it by tapping on the Settings gear on the puzzle list, then tap Configure Account > Help. Tap 'Lost Password' and enter in your original Crosswords account email address, and the password you'd like to reset it to. Then tap 'Reset Password'.
After you tap 'Reset Password', an email from 'info@standalone.com' will be sent to your email address. Click on the link in the email and your password will be reset to your newly assigned password.