Log Out Completely
Closing or minimizing your browser or typing in a new web address when you're done using your online account may not be enough to prevent others from gaining access to your account information. Instead, click on the "log out" button to terminate your online session. In addition, you shouldn't permit your browser to "remember" your username and password information. If this browser feature is active, anyone using your computer will have access to your brokerage account information.
Look at the screen below. Do you see the option to Sign Out next to the user name Carlos Miranda
Use Your Own Computer If You Can. It's generally safer to access your online brokerage account from your own computer than from other computers. If you need to use a computer other than your own, you won't know if it contains viruses or spyware. If you do use another computer, be sure to delete all of the your "Temporary Internet Files" and clear all of your "History" after you log off your account.