How do I subscribe to/view content that hasn't been added to Kbin yet?

I haven't figured out how to view new content through kbin which hasn't been "added" yet.

If I go to "kbin.social/d/mastodon.social" I can view posts from that Mastodon instance.

But if I go to, say, "kbin.social/d/seafoam.space" it doesn't work.

I've tried:

• Searching for the urls (website.example, https://website.example) in the search bar
• Appending "!" and "@" (!website.example, @website.example)
• Searching for specific users, including with prefixes (user@website.example, @user@website.example, !user@website.example)
• Adding the kbin URL to the previous examples
  (kbin.social/d/@website.example .../m/@website.example .../d/website.example)
  Etc etc

I'm probably doing something completely wrong but I can't seem to get Kbin to pick up on new content it hasn't seen before.