1.Create a docker-compose.yml file similar to this:

services:
  app:
    image: 'jc21/nginx-proxy-manager:2.15.1'
    restart: unless-stopped
    environment:
      TZ: "Australia/Brisbane"
    ports:
      - '80:80'
      - '81:81'
      - '443:443'
    volumes:
      - ./data:/data
      - ./letsencrypt:/etc/letsencrypt

This is the bare minimum configuration required.

2.Bring up your stack by running

docker compose up -d

3.Log in to the Admin UI

When your docker container is running, connect to it on port 81 for the admin interface.

http://127.0.0.1:81

This startup can take a minute depending on your hardware.