1Open the Microsoft PowerPoint presentation file that you want to upload to YouTube. Make sure that it is completely finished and free of errors.

2
Click "File," then click "Save & Send" to load up the alternative export options.

3
Click "Create a Video" under the "File Types" list, then click "Computer & HD Displays." Select the "Web" option from the list, then click "Create Video."

4
Specify a location for your exported video to be saved, then click "Save."

5
Go to the YouTube Video File Upload page (see the "Resources" section of this article) and click "Upload video." Locate your exported video from PowerPoint, select it and click "Upload" to upload your PowerPoint presentation to YouTube.

Here's an article about how to upload PowerPoint to YouTube.
Hope it helps you, too.