How to totaly change used mac to my id only ?

I thought I have everything in my mane and ID but I am trying to due an update and the previous owners ID comes up , then asking for her ID not mine. I have been using it for over 2 months with no problem until now. Please someone help.

That is because the OS was obtained at the app store and it is not transferable - it is tied to the apple ID of the original purchaser forever. You will not be able to update or reinstall (because it is not transferable). The seller is obliged to remove the OS and reinstall the original OS version.
So, you will need to figure out what the version is that you are running and what version the Mac came with. If you cannot contact the seller, call Apple, give them your serial number, and ask them to send you replacement installation disks (if the Mac came with Snow Leopard or earlier). If it was Lion or later, a different approach is indicated. Can you post the model/year/model identifier of your Mac please.

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HT204053 I have an iCloud account on my Mac which has a different account name to that on my iPhone. How can I change the Mac account name to that on the iPhone?

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Surely there must be tens (hundreds?) of thousands of "older" photographers like myself who have troves of old photos that have incorrect EXIF creation date fields, or missing the date field entirely (in which case, as I stated above, cannot be added/edited using LR, PS, FileMultiTool, Graphic Converter, etc.).
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This brings me one step closer to importing my photos in a logical method.
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Recent Technet articles: Property List Editing;
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How to totaly change used mac to my id only ?

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