If you wish to record your screen to make a video tutorial, your first step will be to use one of the following screen recording applications:
Step 1: ScreenApp
Step 2: ScreenCapture
Step 3: Active Presenter
Step 4: FlexClip
Once you're done recording your screen, you can sign up to InVideo's online video maker, upload your screen recording, and add necessary texts, voiceovers, images, etc, to further explain your subject's cause and process.