PSA: if a remote community hasn't been fetched by your instance yet, you need to search for it
I've seen this mentioned a few times already: people wondering why certain communities don't show up in their instance. You need to first search for that community via the magnifying glass icon and type in "[email protected]"
Notice the exclamation mark at the beginning. Might take a few seconds. This will teach your instance about the remote community.
Where's the magnifying glass? I'm very new here and all of this is pretty confusing. Can I get an ELI5? I was able to sign up and I'm not using the Jerboa app on Android and I don't see a magnifying glass anywhere.
What you want to do is search for @[email protected], basically just replacing the exclamation mark (!) for the @ symbol.
Why? Because kbin uses the @ symbol and Lemmy uses the ! symbol for the communities.
Edit: I'm working in an extension for chrome and firefox, it will basically convert the lemmy format [email protected] to the kbin format so you just need to click on it.