Delete the content and create your own scenes, name them however you want, and put the exact name on the startup file after *scene_list command
Like this.
Startup.txt
*scene_list
my_scene_n1
my_scene_n2
my_scene_n3
*create variable_1 false
*create whatever_variable_you_need 0
my_scene_n1.txt
Here you start your bok.
*choice
#choice 1
#choice 2
Here you have a post with lots of info to start with choicescript.