lsp server for GDScript

[VanDeiMin]

Do You have any advices how to configure lsp server for gdscript in emacs? On module site (https://github.com/godotengine/emacs-gdscript-mode) is only enigmatic:"To use it, you need to install lsp-mode on top of gdscript-mode and configure it. To install and configure lsp-mode, see the lsp-mode documentation."
What does it mean "install lsp-mode on top of gdscript-mode"? Are there any special commands or techniques to do it in emasc? Lsp instalation page says gdscript lsp server must be installed manually and redirects user to main page of godot's github.

If I try 'M-x lsp' in gdscript-mode i receive an error:
LSP :: Failed to connect to localhost:6005 with error message make client process failed: Connection refused, :name, gdscript::tcp, :buffer, nil, :host, localhost, :service, 6005, :nowait, nil, :tls-parameters, nil, :coding, no-conversion