I know people are confused about how fediverse works and how to use it. This is an attempt to compile a list of beginner's guides made by some amazing people on this topic.
Unsunny's Guide - An easy to read guide aimed at redditors migrating to Lemmy or Kbin
I will update this list if any new guide is made so you can save this post for later. Also, if anyone has any good guide to add post it in the comments and I'll add it here.
you basically have to find the !community@domain string, then copy it and paste it back into your home instance search field & search for it, then navigate to it from your home instance to subscribe to it.
it's very cumbersome but it does work. perhaps things will change in the future, or maybe not.