Again, you didnt reply to my message ( so i didnt get a notification)
Then you have a few choices - but this is NOT a simple matter especially if you are not clued up on security.
There are a few ways but you will need to read up on them
Here are 3 off the top of my head (in order of dificulty)...
- ngrok - simple to get up and running (there is an contrib node for ngrok)
- use a VPN
- put nginx or HAproxy infornt of node-red and expose it via your router.
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Also, there is an extensive setup FAQ here: Node-red server with nginx reverse proxy howto guide