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Select the File tab, then select Info.
The current author is listed on the right, under Related People.
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Right-click the author name, and then select Edit Property.
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In the Edit person dialog, type a new name and select OK.
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Go to the File menu and select Properties.
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Select the Summary tab, and in the Author field, modify the name of the author.
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Select OK.
Changing the author's name isn't currently possible in PowerPoint for the web. You can, however, change the author's name in the PowerPoint desktop app.
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To open the desktop app, at the top of the ribbon, select
 Editing and choose Open in Desktop App. ​​​​​​​
Don't have the PowerPoint desktop app? Try or buy Microsoft 365.