Maybe this tutorial from BTC sessions might shed a light, amongst Damus client he talks about relays as well 👍😉 NEW TUTORIAL: How to setup and use Damus.
This video is geared towards newcomers, so share it around with anyone looking to get their feet wet with Nostr!
Features Nostrplebs, Wallet of Satoshi, Start9 and Umbrel.
https://www.youtube.com/watch?v=fG1IDm-lQek