That's a WordPress site afaict, I don't see any NodeBB installation - what have I missed?
This plugin uses Katex to render the tex code inside your posts, it seems to work well with the markdown plugin.
\(...\)for inline maths, and
$$...$$for maths blocks.
$to wrap inline tex code.
$button has been added to the composer toolbar to facilitate usage.
Feedbacks are welcome.
Oh awesome, a LaTeX plugin! Very cool