You can’t assign ports via DNS, what you need is a reverse proxy. Nginx proxy manager is easy to use and very popular.

Or “if you’re having trouble there is no manual, FAQ, or wiki, just join our discord troubleshooting channel” vomit

The best is when people tell you to RTFM and the information you need just straight up isn’t there.

Honestly these things are really vital to learn if you want to be self hosting, however if you’re unfamiliar with them I would not start with your password vault. You’re almost certainly going to make mistakes and risk losing the vault. I would learn on something less vital then once you’re feeling more comfortable add vault warden.