1. Go to Authentication>Signing in>Sign-in pages>Click New Sign-In page
- Give it a name, then customize it on what you would like it to say.
- While you are in the page you are creating you can customize the logo and background color that will appear on the sign in page; as well as the post and pre auth notification.
2. When you are finished click save changes
For more information please go to the following admin guide