@pitaj I have another question. Can to show to a user just users who is from his group?
And I want to show to a user only the group he belong to. Is this possible? Thanks!

@pichalite I selected the 'Hidden' button and the group is completely hidden, but I want the group to be visible to the administrator and the users who are part of it.
I also want users to be hidden, but a specific user can only see users who are part of the same group with him. For these I need a new custom plugin, @julian?

Oh, meanwhile has appeared the "Subscribe" button. Thanks!

@psychobunny How to use this plugin? (https://github.com/NodeBB/nodebb-plugin-category-notifications). I installed it and activated it, then I restarted the Nodebb forum, but I do not see anything changed. What to do?

@pitaj Ok. I understand. Thank you much!

@pitaj But can this be done automatically by an api / plugin?
I mean:
I want to put this forum on my website. On my website I will have users who will register / log in.
These users on my site, will be divided into groups.

1. When a user registers, can I automatically do a nodebb account for him?
2. Are there any api or plug-ins where the newly created user is automatically assigned to a group in nodebb (the same group that the user belongs to in my website)?
   Something like: Automatically create the groups (from my website) in nodebb, automatically create the categories (with the same name as groups) and automatically give permissions to a group for a category.
   Thanks!

@pitaj That's it! Thanks!

I mean each group to have its own wall

@pitaj

Yes, it works. Thanks!

I have a new question. Can I make more groups to have just separate discussions and a group will cannot read the other's group discussions?

thank you, @alexsir. It works but I have another error...
TypeError: Cannot read property 'node' of undefined
at Object.versionCheck (C:\Users\catalin.marcu\Downloads\NodeBB-master\NodeBB-master\src\prestart.js:71:26)
at Object.<anonymous> (C:\Users\catalin.marcu\Downloads\NodeBB-master\NodeBB-master\app.js:52:10)
at Module._compile (module.js:624:30)
at Object.Module._extensions..js (module.js:635:10)
at Module.load (module.js:545:32)
at tryModuleLoad (module.js:508:12)
at Function.Module._load (module.js:500:3)
at Function.Module.runMain (module.js:665:10)
at startup (bootstrap_node.js:187:16)
at bootstrap_node.js:608:3

I want to install nodeBB. I've cloned the repository and when I type "node app.js --setup" says:
Error: Cannot find module 'nconf'
at Function.Module._resolveFilename (module.js:527:15)
at Function.Module._load (module.js:476:23)
at Module.require (module.js:568:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (C:\Users\catalin.marcu\NodeBB\app.js:28:13)
at Module._compile (module.js:624:30)
at Object.Module._extensions..js (module.js:635:10)
at Module.load (module.js:545:32)
at tryModuleLoad (module.js:508:12)
at Function.Module._load (module.js:500:3)
What can I do?