My mac was given to me by a family member I did not buy it, but now it needs to be fixed. What do I do?

I did not purchase my mac, it was given to me by a family member. Unfortunately, this family member thinks he is a computer wiz and unfortunately there are several things that do not work on this computer. For some reason, his Apple ID is signed in to the Apple Store and Itunes and It will not let me change that. Secondly, facetime and Imessage are not working on the computer even though my Apple ID and passwork are correct and I have iMessage enabled on my ipad and iphone and I have the correct number associated with facetime and iMessage.
I am at a loss of what to do because, again, this computer was given to me. I don't have any service warrantly or anything for this computer--that I know of. Am I allowed to even go into the Apple Store? I have no idea what to do.
HELP.

Do a clean install of Mac OS X boot into recovery by restarting the computer and holding Command R as soon as the boot chime happens (its the bahhh sound) wait for the computer to boot into recovery and after it has booted a small Window should pop up click Disk Utility, the Macintosh HD and then select the erase tab on the right and erase the drive with the erase button. After its done erasing exit disk utility and click reinstall mac os x or reinstall mavericks.

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