You can't make a powerpoint. I mean, you cannot make a software like powerpoint or exactly like powerpoint. XD 
But you can make a powerpoint presentation using powerpoint.

Here are the steps:
1. Plan on what you are going to put on the presentation.
2. Pick a template.
3. Put what you are going to put, first, make a title. 
4. Press enter to add a slide.
5. Add animations.
6. Slideshow to preview what you have made.