Server Management > System Settings > Power Options
This page allows you to reboot or shut down the server.
NOTE: When performing power operations on the server, there will be no output to the GUI indicating status. It is highly recommended that you do not perform a reboot unless you have a provision for on-site monitoring or assistance in the event that the system fails to automatically start.
WARNING: Selecting Shutdown will issue a “halt” command to the server, and power can not be restored without physically manipulating the server power switch. This might not be the best of ideas. I hope you know what you are doing. Seriously.