Hello @plittlefield,
you need to change the docker-compose.yml file of bitwarden. It should be under bwdata/docker.
ports:
- "80:8080"
- "443:8443"
The left side (ports 80, 443) should be changed to the desired ones. Example:
ports:
- "8080:8080"
- "8443:8443"
then adapt nginx approprietly.
Hope this helps 