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Can you tell me which operating system you have? Is this a Windows Vista/7/8? Or a Mac?
Typically in a Windows system you will:1. Click the Windows button in the bottom left of the screen2. Click the right arrow next to the word "Shut Down" this will give you a list of options, you can select Restart from these options3. Select Restart and the computer will restart for you
On a Mac:1. Select the Apple Menu (the Apple in the upper left of the screen)2. Select restart3. Allow the computer to restart
Let me know if this helps or if you have further questions. Thank you.