Configure the postgres container to use persistant storage or leave it out completely if you already a postgresql database running somewhere else
Run docker compose up -d or docker-compose up -d depening on your docker version. You can leave out the -d option to get a direct view of the logs the containers produce, which is nice for debugging your configuration
Open the frontend in your browser at http://{your server address}:{NITRO_PORT}
Log in with the ADMIN_USERNAME and ADMIN_PASSWORD
Optionally create a new user account without admin privileges for normal use