if you use it from the browser, it’s pretty easy as long as you save a copy of your private key somewhere (websites will offer to create it for you),

this is the one that is a little closer to lemmy/reddit: satellite.earth/…/npub1wg6u23gjc2y33fxukr284fy8p8…

this is the one thats a little closer to a discord/irc chatroom: nostrchat.io/…/08642dad6729819cc79650d18b93c5c913…

haven’t used it from apps, so can’t comment there.