Download a modpack according to your launcher below and import it.
If you install the modpack, the server should already be in the multiplayer menu.
If not, the IP is ghostnoise.ru
If you are using the official launcher, first install Forge for 1.20.1, launch it once, close it and then copy the files from the minecraft folder of the PrismLauncher zip of the modpack to your .minecraft folder.