Step 1: Login to your client area.
Step 2: Go to, My Products & Services and here all of your services will be listed.
Step 3: Open the service which you need to be rebooted.
Step 4: Now, scroll down and you find the following:
Step 5: To reboot, click on "Manage Server Power". And you will find the following options:
Step 6: Choose "reset" and send the command to the server.
That's it !!