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Setup
To start you need to go to your install location and file the file 00console.rpy That's 00 NOT OO and rpy NOT rpyc
%gamepath/renpy/common/00console.rpy
Open this file in either Notepad, Notepad++, VS, etc. I prefer Notepad++
On line 108 of the file you'll find
config.console = False
Change this to
config.console = True
If done correctly you can launch the game and press Shift+O to open the console.
Make sure you're not in any submenus when you make changes.
E.G) In a Shop or Item menu
If you do, anything you've done in that menu will be reset. So if you've read the Shibari book to 80%, then open the console to change something, your progress will reset to what it was when you opened the menu.