The simplest way to restart Box Of Stops is just to unplug the Raspberry Pi, and plug it back in again. Box Of Stops will then automatically re-launch itself as part of the boot up sequence for the Pi.
The alternative, if you are working with the command prompt on the Raspberry is the sudo reboot command:
Note, both of these ways assume Auto start has not been disabled.
Stop and Start
The alternative, if a more controlled restart is needed, is to stop and start Box Of Stops manually.