I added more items to the system menu. I didn't put them in the guide, so you'll have to merge these items with the others if you are doing the relay control:
- action: shutdown
command: sudo shutdown -h now
confirm: You are about to shutdown the system
- action: reboot
command: sudo shutdown -r now
confirm: You are about to reboot the system
- action: srestart
command: sudo service octoprint restart; sudo service octopipanel restart
confirm: You are about to restart octoprint.
That goes in the .octopi/config
Also note that I have an "octopipanel" service, and you probably don't, so you can edit that line too.