Restarting your virtual private server can be done within your Media3 control panel. Once logged in click "My Cloud Services", your server name will load on the right and you can then click the Windows logo next to it to manage. A new menu will load on the left and the last option down will say "Utilities". Click this, and server monitoring will load by default, click the tab next to server monitoring that says "Reboot". You will then be asked to type "YES" to confirm the server reboot. Type YES and then click "Reboot Now". Your server will reboot and should be back online in 5-10 minutes.
You can also reboot your server by connecting to it with remote desktop and rebooting it from the windows start menu.