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Helpful answers
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Sep 22, 2016 7:15 PM in response to Kathleen_Eby Carolyn Samit,Follow these steps to change the email address that you use as your Apple ID > Change your Apple ID - Apple Support
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Sep 27, 2016 2:24 PM in response to Kathleen_Eby 000FFF,If you want to change the name you have associated with your Apple ID, either of the above links provided will allow you to change your last name. If you are wanting to use your own Apple ID with FaceTime and the App Store on your grandmother's iMac, then open the Mac App Store click Store at the top left of your screen and select Sign Out. Then sign back in with your own Apple ID.
Be careful with this though. Any apps downloaded with your grandmother's Apple ID will not be able to be updated and may require deleting the app and then downloading it again using your own Apple ID. If the app was a purchased app, you would end up having to buy it again.
Personally, I would recommend doing the steps in this article so the iMac is set up as new for your own use: What to do before selling or giving away your Mac - Apple Support.