Check out the pinned post for a general guide to the community that includes lots of relevant examples.
The community is located on kbin. In case you don’t see any posts, no one from your instance has yet subscribed to the community. Subscribe and you’ll see new posts going forward. There are a dozen threads there right now.
Links are a still somewhat a mess, but hopefully at least one should work:
So a link that looks like !community will look for the community on the local instance, which works fine for you because it's ON your local instance, but not for me because I'm on another one.
A link that looks like yourinstance.tld/c/community will look for the community on your instance, which works fine if you're logged in there like you are, but I can't interact there because I'm on another instance.