Don't worry! You click here to request a password reset link.
You can also follow the steps illustrated here:
1. Click on 'Log in'.
2. Select 'Forgot your password?'
3. Enter your email address and click on 'Reset password'.
4. An email gets sent to you.
5. Locate the email in your inbox (remember to check your spam folder if it isn't there) and click on 'Reset my password'.
6. Enter in your new password, and also enter it a second time to confirm it. Then click on "Reset password".
7. You can now log in with your email address and new password.