To configure it, simply add the nostr.mutinywallet.com relay to your nostr client, and configure it to only upload, not download notes. Then disable upload for all other relays.
Write a new note, and see in a third party client if that note shows up. If yes, you can rest assured that many may read your notes, but only a few learn your IP address.
If you use a VPN or Tor ontop, then even the mutiny wallet and cloudflare server do not learn your IP.