If you cannot figure out the little button with a circle and a line is power, how do you think you are running windows? If you cant do that, then plug it in and push each button one at a time - observe which one makes it do something and write it down...
I mean I think everyone should have a computer but there are limits....
and this sounds sketchy to me - are you sure its not lifted from somewhere? No manual, the "friend" cant be bothered to help you with the power button? I only hope they had a boot password ...