problem solved
Thanks to everyone who tried to help

My version:
nodebb v 1.13.2

@psychobunny You are the creator
Does it really not fit the version?

@Sandeep
Thanks!

I did,
But that made no difference.
The plugin still doesn't work

Hello to all the friends.
I'm trying to install this plugin from here:
https://community.nodebb.org/topic/211/nodebb-plugin-youtube-youtube-embed-plugin/2?_=1581262595769

I did as it was written.
But it's not turned on for me.

what could happen?