If you're using a public computer to access Blueleaf, you'll want to take care to make sure your information isn't accessible to anyone else.
1) Make sure you click on the sign out link on the left each time you use Blueleaf. It will bring you to the login screen and that is your confirmation that you've successfully signed out.
2) You'll want to refuse any offer to save usernames and passwords in the browser of any public computer or in any password helper software of any public computer.
As an added security measure, Blueleaf automatically signs you out after 60 minutes of inactivity.