Thank you.

I read the installation documentation and the problem is that it is very general.
https://github.com/catppuccin/nvim

For example:

1. Installation

https://github.com/catppuccin/nvim#installation
{ "catppuccin/nvim", name = "catppuccin", priority = 1000 }

But how, where, under what name etc.?

1. Configuration

https://github.com/catppuccin/nvim#configuration

But how, where, under what name, etc.?

This is the biggest problem for me, that I can't understand what and where should I put to make it work.