Press the MENU button on your remote control, and go to "Settings".
Then, on the second tab, check "Allow Zappiti to update the status of visualization".
After this, the viewing status of your videos will be managed automatically on Zappiti.
You can also change the viewing status of a video manually.
To do this, press the MENU button on your remote and you can choose the one that you want ("Seen", "On going" or "Not seen") in Status.