Did you try running npm install in your nodebb folder? nodejs 15 is not supported use 16 or 18

Depends, what operation are you performing?

Hello, buddy, I would like to ask ordinary users to post with the icon can not send, indicating that I have no permission, I would like to ask this in the background where to set?

Hello, may I ask why I added the site icon without changing it? Is it overwritten? I think this may be a bug. If I restart nodebb, the icon will change, but when I refresh, it will change back to the default site icon. How to solve this problem

You need to put the popular tags widget on the categories sidebar and use the custom css/js from the other thread.

My mistake, thank you

@DanAdair No problems. You can also find the widgets used on the categories page here in the same area (widgets) - you just need to add them as they are not by default.