It is very simple to speed up or slow down a video or music with the video editor and you don't even need to study a large article:

  1. Add a file and wait until it is fully uploaded and processed.
  2. Click on the file to show control buttons.
  3. Choose the editor button .
  4. In the opened editor work with speed property, where:
    1
    normal speed
    < 1
    slower
    > 1
    faster

Now you can go back to the main page of the video editor and click "make a video".

The video tutorial shows you how to speed up the video: