I have a new iMac OSX Mavericks.  My user name for Apple apps is wrong but I can't change it.  I don't know where it came from.

How can I change the Apple ID that seems to have come with my new computer???  It will not go away even though I have gone to accounts and checked out what is there.  It is right in the Accounts but what can I do to change it on my computer?  I can not download any upgrades.  Thank you.

Going to my account did not work because it's the right information.  When I have trouble is when I'm trying to sign in for upgrades.  There are some letters in the "sign in" box that will  not go away...and I can not put the right sign in in that space.  Which means that I can not upgrade Pages or any of the rest of the apps that came (free) with this new computer.

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