*finish can be used anywhere in the game, whether it be after a paragraph or as part of an option in a *choice table. *finish will skip over the rest of the chapter and on to the next chapter listed in the *scene_list at the beginning of startup.txt.
By default when used after a paragraph, Choicescript will display a button at the bottom of the screen with the words "Next Chapter" on it, but you can customize the text displayed by following the *finish command with the desired text.
*scene_list startup chapter_1 chapter_2 chapter_3 Man, this chapter sucks. *finish Let's blow this jointLooking for a little more detail? Try the wiki page