If you've forgotten your password, you can reset it by following these steps:
1. Go to the login screen.
2. Click the 'Forgot password?' link under the 'Password' box.
3. Enter the email address that you use to log in. This will send an email to that address.
4. Check your inbox for the new password request email, and click the link it contains. (If you don't initially see it, you might just want to check your junk folder, in case it's been put in there.)
5. On the page that loads, enter your email address again and enter a new password, followed by confirming that password.
6. Click Submit, and then login using your newly reset password.
7. You will get a message that your password has been updated and a link to log in.
And ... that's it, you've successfully updated your password.