sudo nano /boot/config.txt
@xscreensaver. You'll also want to add the following lines to that same file
@lxpanellines. If you want to be able to easily access the "menu" at the top of the screen do not do this step.
unclutter -idle 0.1 -rootto /etc/xdg/lxsession/LXDE-pi/autostart with
sudo nano /etc/xdg/lxsession/LXDE-pi/autostart