Are you sure you want to log out?
If you log out you will need to re-enter your username and password each time you come back to the site. If you would rather stay logged in, don't log out and make sure you click the 'Remember Me' tickbox when you log in. Simply close the web page and the site will remember you for next time.
If you are on a computer which is used by other people it is probably better to log out. To do this click the link below.