I don't understand some things

Hello, my dear friends!

following these instructions, I was able to run jitsi in the docker container
but I still couldn’t figure out how to remove port 8443 after the domain.

could you tell me what and where I should edit the configuration to remove port 8443 after the domain?

And I also need to know, how should I edit this configuration? Is it inside the container or is it an external config of an already completed site?

Thank you, friends. Any words from you will be very helpful to me.