Rebooting and shutting down functions are belong to the Network Settings section. You might have some occasion to reboot and shutdown your server in any case. You can conveniently Reboot or Shutdown on your Logsign interface.
For example, If you update your network settings you need to reboot your system to apply this change. Or if you want to port your VM Ware to another hard disk first of all you need to shut down the current server.
1. You can find these button on Settings > General Settings > Network Settings