We have Lemmy.world, Lemmy.ml, beehaw.org, I think even yiffit.net. If I log in using wefwef it asks me where I want to login. And when I make a new account using another instance, it says ”… Lemmy is federated, so you can interact with everything on lemmy.ml even if you’re registered on a different instance.“ So if I’m registered on lemmy.world, how can I interact with lemmy.ml?
you can interact w/ lemmy.ml through lemmy.world. for instance, you can subscribe to furry_irl on yiffit witj your world account, if you visit that something like lemmy.world/c/furry_irl@yiffit.net (url may be incorrect, it’s just an example)