In the Firebase Forge, navigate to the 'Auth' section. Under the 'Authentication Providers' header, select the 'Email & Password' option, and check 'Enable'.
It's now just called "Simple Login". See https://pbs.twimg.com/media/BjMkJAjCMAAvCGT.png
Now when we register, we should be redirected to the posts page and a log out button should appear in the navbar.