Look for blocks of code that look like this:
Editing Ren'Py games can range from simple text corrections to complex addition of new mechanics. Because Ren'Py is open-source and based on Python, it is generally very moddable, provided the developer hasn't encrypted the files. how to edit renpy games
You cannot just double-click the game's .exe to test your edits immediately if you changed the file structure. Look for blocks of code that look like