How to change default port debian10

Hi all.
I have a fresh install of an debian 10.
I have read this link : https://fatiherikci.com/en/install-jitsi-meet-on-debian-10/

I have setup secure connection.
But i need to change the default port 443 and 80 because i have already an another web server on NAT.

How can i change this ?

Thank’s for your help.

It may be a better solution to route https traffic by request addresses.