Could you please explain me the steps in making a green screen in Camtasia Studio?
The process of making a green screen is long and tedious, but it can be accomplished. Besides Camtasia, you will need a camera, and a panel with solid color to film something or yourself, and then use the Remove color function from Visual Properties to add everything you want.
There are in-depth tutorials and guides available on the TechSmith page: https://www.techsmith.com/tutorial-camtasia-8-remove-color.html