There are 3 switches on board. Reset Button, Power Button and SD card Boot button. For powering on your Odinub you just have to plug in the power cable in the micro USB plug. If you want to shutdown you can press the power button which will kill all the process and shutdown the device. For reset you can press the reset button it will reboot the Odinub. Also for a reboot, you can you init 6 commands on the terminal or you can use GUI.