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How do I install Windows 7 home premium

Hello i bought a used Windows laptop it's a gateway nv53a laptop but I'm kinda new at Windows but anyway I bought this laptop from a friend and I took it home and resetted it and now it's asking for a Windows 7 product key and how would I get one oh and also the product key isn't on the back or side of the laptop i checked and can't find nothing so how would I find my product key thanks

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@jj14378 read through this answer from Microsoft

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Kenneth shawn crwdns2934231:0crwdne2934231:0
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