Openmediavault-Let's Encrypt

I have OMV running duckdns and jellyfin, and all is well. I would like to create a little more security with LetsEncrypt. Using portainer I found a template for LetsEncrypt now I'm lost as to how to fill it out. I cant find any examples that are relevant to me. For instance the 1st drop-down says bridge, host, jellyfin_default, none. The next is email, do i need this one also?. Confused