Facing issues while setting up cluster on AWS

I’m new to crate and I’m also facing some issues setting up a cluster (on AWS EC2). It’s my first try tho but I’m not able to figure out any default credentials for the crate superuser which allows me to get into the admin ui.
I was trying to launch EC2 from the AMI crate-3.1.0-1-1-amzn-ami-hvm-2018.03.0.20180412-x86_64-gp2 - ami-0f3bed45f0b9fe644 does anyone have a hint?
I saw that auth stuff is a enterprise feature (which I don’t have) but so far I was not able to figure out the necessary steps to get into the UI.

Please find the guide that explains the deployment process to AWS cloud: