You have not logged in!
If your PC freezes, your net-connection is lost, etc. you will lose your work.
You should log in to get access to the save-function of the system. Added to the benefit of extra security is the opportunity to do your work on other computers whenever you want.
Please, check the top right corner of your screen for further information. You log in (or register) to OpenClass in the menu to the left on the 'home' page.