should be shift + O, but if that doesn't work it might not be enabled, luckily its not to complicated to enable both developer mode and therefore the console,
in order to enable developer mode, go to the games folder, go to renpy, common, and find the file labels 00library,
you can use notepad++ for easy editing of these files
in notepad++ scroll down until you find these lines
init -1000 python:
# Set developer to the auto default.
config.original_developer = "Auto"
if config.script_version:
config.developer = False
config.default_developer = False
else:
config.developer = True
config.default_developer = True
by changing the words "Auto" and "False" to "True", you can enable developer mode and the console.
this can also be applied to most renpy games (at least as far as I've tested)