Where are the user and password from the docker guide from?

Hello, this might be a stupid question but, i am new to Xibo and followed the Xibo CMS docker guide and everything went smoothly until i got to singing in on the web client of the server, no matter what i used it did not let me in.
So i would like to ask what and where exactly the user and password are and where i can change them. I tired first in the Nano file but the information i entered there at the user and password parts was not the same as on the web client. I suspect it is something extremely simple but i am in a time rush and just want to get into my server.
Any help is appreciated.

They’re listed here:

Thank you very much, as i expected somewhere in plain sight.