Used macbook keeps showing old users iTunes account

HELP……I am so sick of this crap……I purchased a used Macbook from a local computer shop that takes them in on trades.  Well, I get home and the thing is great.  I love it except for one **** thing.  I CANNOT get the old users account to stop showing up under the app store.  The old account keeps telling me that two of my apps need updating, which I cannot get the old persons account logged off because I do not know their password.  The username mkp0818 is what keeps popping up and therefore I always have a two over my app store icon, because it shows that those two apps that the other party owned needs updating and of course I need help…..Hurry...

You need to erase the hard drive and install OS X either from the installer discs that came with the computer or from an Internet Recovery, whichever is supported by the computer. If it's a 2012 or late model you use Internet Recovery. If before 2012 you will need the installer discs that came with the computer when it was new.

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