Assume you select user_name > Preferences in the upper right corner of the page, select Show these options at sign in, save your changes, and log out. The next time you log in, the preferences page is displayed. However, if you log out and then delete all cookies in your web browser, the next time you log in, the preferences page is not displayed. This is because preferences are stored in the cookies of the browser. Clearing the cookies resets the preferences.