A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
>> I click on File>Share and a pop-up window opens
It's not clear whether you're doing this from OneDrive or from within PowerPoint.
In case the former, try clicking the file to open it in PowerPoint web.
Then choose File | Share | </> Embed this presentation
Then follow the steps to get the embed code you need for your web page.