The settings are saved when closing MP properly, i.e. not "closing" mp by shutting down the computer. You could also save the username/password in online videos plugin configuration inside the mp configuration app.
Thanks, but that is what I have done. I have configured password both in MP configuration and inside the online videos plugin. When done I manage to get into TV4Play, but after returning from hibernation online videos asks me to provide a password (which is now blanked).