The Nostr account private key belongs only to you and is the only unchangeable password. Don't send your private key to anyone else. Neither the Relay nor the client owns the account. Even if all the relay and clients were destroyed that day, the Nostr account still belongs to you. This is Nostr.
Discussion
I meant do relay urls follow the account or the app? like if I use a different app will it remember my relays? it looks like it does because I have a lot but not sure
As long as you modify the relay list, add your favorite relay address. Freerse will default that this is your relay list. Upload your relay list to relay synchronously. So you have your relay list. Freerse will check when you log in to sync your online relay list. I'm not sure if all clients do this. If a client does not check and process, you log in, it will cause your relay list and follow list to be lost.