I was able to make it work with /forum; no ^~ required. Given what @yariplus stated this seems relevant.
Indented lines are ones that I copied from my other blocks that weren't present in the suggested.
a question NodeBB can be installed in the host ?
I did not understand anything about installing in the host
What host? There are installation instructions for some things here:
NodeBB is designed to work best under a virtual private server. Using a traditional hosting service is not recommended as they do not have the capabilities to power NodeBB effectively.
Thank you for your interest in NodeBB!