Any user or community just has to be prepended with lemmy:, for example hit Go to User and enter lemmy:efraimbart to view my profile. To view any community or user not on the default instance you can append @<instance> to it, for example lemmy:efraimbart@lemmy.world.

Yeah, that’s on me as I’m still working out the documentation. Essentially you prepend any user or community with the service you are attempting to hit up, so to view posts from android you would navigate to lemmy:android@lemmy.world.

Feel free to reach out with any other questions!

Everything is a middleware that connects with multiple services and currently has early compatibility with Lemmy. See here.

Have you checked out Infinity for Everything?