If you still happen to have Windows XP or Vista, there was a free movie editing software that came with the operating system called Movie Maker.
If you are an Apple user with a Mac, the software to edit movies is free and actually quite extensive in its abilities to edit movies.
If you are using Windows 7 and beyond, you will have to purchase some editing software, like Adobe Premiere Elements, Sony Movie Studio 13, and others. They generally run in the $50 plus range. We are currently looking at free software possibilities to help you at least create some basic video presentations. More information is forthcoming.