Start VM

If your virtual machine is stopped, to restart go to the details view for your virtual machine and click on the "Start Virtual Machine" on the far right panel.

Vmdetailview Start

Or, from your browser view, click on Startbutton to start it.  You will be asked to confirm this action.

Startvm

Note: You should always check your virtual machine after you have restarted it to make certain everything is in proper working order.