After the EC2 instance is started, you can access the JupyterHub Server with its public IP address. For example, if the IP address is 18.104.22.168, typing http://22.214.171.124 in the browser will bring you to the following startup page:
The preconfigured username and password are jhub-admin and the EC2 instance ID.
If it is the first time for you to log in, you will be asked to change the password.
The admin console can be accessed through http://126.96.36.199/auth
The preconfigured username and password are keycloak-admin and the EC2 instance ID.
Click Add user
Enter username and click Create
Select Credentials and click Set password
Enter password and make it temporary such that the user will be asked to change it when logging in for the first time
Click Save password