To turn on, turn off or reboot a VM, go to your personal account, in the Cloud tab, select the machine. Then You will go to the interface with detailed information about it, as well as available actions. Click the start button to turn on the machine. 

Wait a few seconds. Done! The machine is running.

You can restart the machine by using the "Reboot" button.  

Select reboot settings - Regular or Hard. Wait a bit and the machine will reboot.

To turn off the machine, click the power off button.

Select the shutdown settings - Regular or Hard. 

Done - the machine is turned off, its status is marked in gray.