You don't need a YouTube channel or a script. Sign in, open a video file or record one, then press Auto edit. If you wrote a script in TubeSpanner, you can link it, and if you didn't, Auto edit works from what you said. Prefer to do it all yourself? Press Edit it myself instead.
Plans. TubeSpanner Editor is included in the 14-day free trial you get when you sign up, and in TubeSpanner Pro. When a trial ends without Pro, the editor shows the plans, and anything you made stays on your computer.
Which videos. Auto edit is ready for talking-head and reaction videos. Other kinds are still in beta.