@pitaj I think for the same reason you can disable themes for users, To have a particular style for a website and not letting the user mess with it in case of bugs.
How can I login to ACP?
When I try to access to http://127.0.0.1:4567/admin on my local computer, the NodeBB asked me to login, what username/password should I use?
the user name and password of your user you created when you set up your NodeBB installation.
@Scuzz Thanks! I think I forgot my username and password, but I have re-install it