How do I change the title of a PowerPoint exported to PDF?

I reply even if it an old post, it was the first answer when I search in google

So in Office 2016, you need to click on File and on the top right you can set some attribute for your document, including the title that will be set when then exporting to PDF

I had the same problem. I found the answer for PowerPoint. Open your PowerPoint file, then under the file tab, under Info, on the right side, you'll see Properties. Under Properties, one item is "title" and when you hover of the title an editing box appears. Change it there.